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  • Rural Digital Europe
  • 2021-2021
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Lucas Molz Lara; Luciano Gebler; Mirabor José Leite Júnior; Alencar Lucas Soares;

    Abstract Brazilian fruit culture has a great influence on the social and economic sector in the most diverse regions of the country, generating employment and income in the exercise of its activities. As it is an activity carried out most often in a manual and conventional manner, fruit culture has a great potential for technological growth, especially when adopting the concepts applied by precision agriculture on the crops of grains, fibers and energy, creating a new segment, Precision Fruit Farming. The present work aims to carry out a bibliographic review on the main trends that have emerged in the last five years on Precision Fruit growing, highlighting its future perspectives and the history of technological evolution. 83 articles were analyzed, classified in different perennial cultures and applications, such as machine learning, remote sensing, robotics, using UAV to obtain different vegetation indexes, among others. Resumo A fruticultura brasileira exerce grande influência sobre o setor social e econômico nas mais diversas regiões do País, gerando emprego e renda no exercício de suas atividades. Por se tratar de uma atividade realizada, na maioria das vezes, de forma manual e convencional, a fruticultura possui grande potencial de crescimento tecnológico, principalmente ao adotar os conceitos aplicados pela agricultura de precisão sobre as culturas de grãos, fibras e energia, criando um novo segmento, a Fruticultura de Precisão. O presente estudo objetivou realizar uma revisão bibliográfica sobre as principais tendências que surgiram nos últimos cinco anos sobre a Fruticultura de Precisão, destacando suas perspectivas futuras e o histórico de evolução tecnológica. Foram analisados 83 artigos, classificados em diferentes culturas perenes e aplicações, como machine learning (aprendizado de máquinas), sensoriamento remoto, robótica, utilização de VANT para obtenção de diferentes índices de vegetação, entre outras.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scientific Electroni...arrow_drop_down
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    DOAJ
    Article . 2021
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    Revista Brasileira de Fruticultura
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    Revista Brasileira de Fruticultura
    Article . 2021 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scientific Electroni...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      Article . 2021
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      Revista Brasileira de Fruticultura
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      Revista Brasileira de Fruticultura
      Article . 2021 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Dante Teixeira Valente Júnior; Lívia Maria dos Reis Barbosa; Marcos Henrique Soares; Gustavo de Amorim Rodrigues; +6 Authors

    ABSTRACT: Increasing fat deposition and feed conversion ratio over the days in finishing phase directly influence pork quality and productive profitability. Nonetheless, the slaughter of heavier pigs can result in benefits for the slaughterhouse due to dilution of production and processing costs, as well as economic benefits for the pig producer resulting from the dilution of production costs. Therefore, dietary supplementation of chromium for finishing pigs of high lean-genotypes is a strategy to increase lean tissue accretion and minimize fat deposition, reflecting positively on growth performance. This review discussed recent studies results and mechanisms of action of this modifier of performance and carcass a traits in finishing pigs. Chromium increases the insulin action, facilitating insulin binding to the receptors on cell membrane. As a result, insulin-sensitive cells uptake more glucose, which will be later converted into energy. This additional energy is use to increase protein synthesis, thereby increasing the amount of lean tissue and reducing fat content in the carcass, without altering protein intake by pigs. Chromium also reduces lipid oxidation rate maintaining meat quality for longer period. In conclusion, dietary Cr supplementation for finishing pigs have shown that 0.2 mg/kg of organic Cr sources for pigs from ~60 kg until the slaughter can improve growth performance, lean gain and reduce fat content in carcass. However, the development of nanotechnology has allowed the use of inorganic Cr source at 0.2 mg/kg of inclusion, leading to improve the growth performance and carcass traits of finishing pigs. RESUMO: O aumento na deposição de gordura e da conversão alimentar durante a fase de terminação são fatores que implicam diretamente na qualidade da carne e também na rentabilidade da cadeia produtiva. Apesar disso, o abate tardio dos suínos pode resultar em benefícios para o frigorífico, pela redução dos custos operacionais por suíno abatido e melhor utilização dos equipamentos, bem como vantagens econômicas para o produtor resultantes da diluição dos custos de produção. Portanto, a suplementação de cromo na ração de suínos de linhagens com maior potencial para deposição de músculo, é uma estratégia para aumentar a deposição de tecido magro e minimizar a deposição de gordura, refletindo positivamente no desempenho. Em vista disso, objetivou-se com este trabalho, apresentar e discutir os mecanismos de ação, finalidades e resultados recentes de estudos na literatura sobre a suplementação desse modificador de carcaça na ração de suínos em terminação. O principal papel do cromo é potencializar a ação da insulina, facilitando a ligação entre a insulina e os seus receptores na membrana celular. Com isso, as células sensíveis à insulina captam maior quantidade de glicose, que posteriormente serão convertidas em energia. Essa energia adicional pode ser utilizada para aumentar a síntese proteica, aumentando assim, a quantidade de carne magra e reduzindo o teor de gordura na carcaça, sem alterar o consumo de proteína pelos animais. O cromo também diminui a taxa de oxidação lipídica, mantendo a qualidade da carne por mais tempo. Em conclusão, a suplementação dietética de Cr para suínos em terminação mostra que 0,2 mg/kg de fontes orgânicas de Cr para suínos de ~ 60 kg até o abate podem melhorar o desempenho, ganho de massa magra e reduzir o teor de gordura na carcaça. No entanto, o desenvolvimento da nanotecnologia tem permitido o uso de fonte inorgânica de Cr na dose de 0,2 mg/kg de inclusão, melhorando o desempenho e as características de carcaça de suínos em terminação.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scientific Electroni...arrow_drop_down
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    Ciência Rural
    Article . 2021
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Ciência Rural
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    Ciência Rural
    Article . 2021 . Peer-reviewed
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    DOAJ
    Article . 2021
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scientific Electroni...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Ciência Rural
      Article . 2021
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Ciência Rural
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      Ciência Rural
      Article . 2021 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      Article . 2021
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Diego Costa Farias; Natanael Costa Rebouças; Thales Silva Coutinho; Rayane de Tasso Moreira Ribeiro; +1 Authors

    Abstract This study aimed to carry out a taxonomic floristic survey of species in the genus Ditassa (Asclepiadoideae/Apocynaceae), as part of the “Flora do Ceará: knowing to conserve” project. The study was based on the analysis of morphological characters of specimens from representative herbaria for the genus. The identifications were performed using specialized bibliography and confirmed by analyzing type collections. For Ceará state, six species of Ditassa were registered: D. blanchetii, D. capillaris, D. dardanoi, D. glaziovii, D. hastata and D. hispida. The species occur in Savana (Cerrado), Stepic Savanna (Caatinga/Carrasco), Dense Ombrophilous Forest (Wet forest) and Lowland Semideciduous Seasonal Forest (Tableland forest). Only D. capillaris and D. hastata were recorded in Conservation Units. Resumo Este estudo teve como objetivo realizar o levantamento florístico-taxonômico dos representantes do gênero Ditassa (Asclepiadoideae/Apocynaceae), como parte do projeto “Flora do Ceará: conhecer para conservar”. O estudo se baseou na análise de caracteres morfológicos de espécimes depositados em herbários representativos para o gênero. As identificações foram realizadas com o auxílio de bibliografias especializadas e confirmadas pela análise das coleções-tipo. No estado do Ceará foram registradas seis espécies do gênero Ditassa: D. blanchetii, D. capillaris, D. dardanoi, D. glaziovii, D. hastata e D. hispida. As espécies ocorrem em Savana (Cerrado), Savana Estépica (Caatinga/Carrasco), Floresta Ombrófila Densa (Mata Úmida) e Floresta Estacional Semidecidual de Terras Baixas (Mata de Tabuleiro). Apenas D. capillaris e D. hastata foram registradas em Unidades de Conservação.

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    Article . 2021
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    https://www.scielo.br/j/rod/a/...
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    Rodriguésia
    Article . 2021
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    https://doi.org/10.1590/2175-7...
    Article . 2021 . Peer-reviewed
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      DOAJ
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      https://www.scielo.br/j/rod/a/...
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      Rodriguésia
      Article . 2021
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      https://doi.org/10.1590/2175-7...
      Article . 2021 . Peer-reviewed
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    Authors: Francisco Roberto dos Santos Lima; Marcos Luiz da Silva Apoliano; Davi de Holanda Cavalcante; Marcelo Vinícius Carmo Sá;

    Abstract The present study aimed at determining the effects of dietary DL-methionine supplementation on the water quality, bioflocs composition and Nile tilapia juvenile’s (initial body weight = 2.76 ± 0.06 g) growth performance in BFT rearing tanks (18 fish/100-L tank). Fish were or not subjected to artificial feed restriction. The experimental treatments consisted of two control groups: 1 - no feed restriction, no methionine supplementation; 2 - feed restriction at 25%, no methionine supplementation. There were also four treated groups: 1 - feed restriction at 25%, dietary DL-methionine supplementation at 0.5%; 2 - feed restriction at 25%, dietary DL-methionine supplementation at 1.0%; 3 - feed restriction at 25%, dietary DL-methionine supplementation at 2.0%; 4 - feed restriction at 25%, DL-methionine supplementation of molasses at 1.0. Supplementation of the commercial diet with DL-methionine has not affected either the water quality of the BFT Nile tilapia rearing tanks or the proximate composition of the bioflocs. After 8 weeks, weight gain of fish reared in tanks with feed restriction and dietary DL-methionine supplementation at 1% or 2% has not differed (P>0.05) from the tanks without feed restriction. In conclusion, it is possible to restrict the daily feed allowances of Nile tilapia juveniles reared in BFT tanks at 25%, with no growth performance impairment, if a minimal dietary DL-methionine supplementation of 1.0% is given. Resumo O presente estudo teve por objetivo determinar os efeitos da suplementação da ração balanceada de juvenis de tilápia do Nilo (peso médio inicial = 2,76 ± 0,06 g), submetidos à restrição na oferta de alimento artificial em tanques BFT de cultivo (18 juvenis/tanque 100 L), com DL-metionina, sobre a qualidade da água, composição dos bioflocos e desempenho zootécnico. Os tratamentos experimentais foram constituídos por dois grupos controle (1 - sem restrição alimentar, sem suplementação com metionina; 2 - com restrição alimentar de 25%, sem suplementação com metionina) e quatro tratamentos experimentais (3 - restrição alimentar de 25%, suplementação da ração com 0,5% de DL-metionina, misturada à ração; 4 - restrição alimentar de 25%, suplementação da ração com 1,0% de DL-metionina, misturada à ração; 5 - restrição alimentar de 25%, suplementação da ração com 2,0% de DL-metionina, misturada à ração; 6 - restrição alimentar de 25%, suplementação do melaço em 1,0% de DL-metionina, misturada ao melaço). A suplementação da ração balanceada com DL-metionina não afetou a qualidade da água de cultivo de juvenis de tilápia do Nilo, em tanques BFT, nem a composição centesimal do bioflocos. Após 8 semanas, o ganho em peso corporal dos peixes mantidos nos tanques com restrição alimentar e suplementação da ração com 1% ou 2% de DL-metionina não diferiu (P>0,05) do observado nos tanques sem restrição alimentar. Concluiu-se que é possível restringir as taxas de arraçoamento de juvenis de tilápia do Nilo, mantidos em tanques BFT de cultivo, em 25%, sem prejuízo zootécnico, desde que se faça a suplementação da dieta com, pelo menos, 1% de DL-metionina.

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    Article . 2021
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      Article . 2021
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Authors: Gabriela Oliveira Pereira; Asheley Henrique Barbosa Pereira; Marilene de Farias Brito; Caroline Argenta Pescador; +1 Authors

    ABSTRACT: Although, serological assays for detecting immune response against Toxoplasma gondii in goats and sheep are frequent in Brazil, studies showing lesions and confirmation of infectious causes of abortion in goats in the state of Rio de Janeiro have not been reported. This study aimed to describe an abortion outbreak caused by T. gondii in a goat herd in the state of Rio de Janeiro. At histological examination, necrotizing encephalitis and lymphoplasmacytic myositis were observed in goat fetuses submitted to necropsy. The diagnoses were confirmed by immunohistochemistry, which revealed positive marking structures compatible with T. gondii bradyzoites in the brain and skeletal muscle cysts. T. gondii should be included among the causes of abortion in goats in the Southeast region of Brazil. RESUMO: Embora sejam frequentes as pesquisas sorológicas da toxoplasmose em caprinos e ovinos no Brasil, os estudos que apresentam as lesões e a confirmação das causas infecciosas de aborto em caprinos no estado do Rio de Janeiro não foram encontrados. Neste trabalho descreve-se Toxoplasma gondii como causa de aborto em uma criação de caprinos no estado do Rio de Janeiro. Ao exame histológico foi observada encefalite necrosante e miosite linfoplasmocítica nos fetos caprinos submetidos à necropsia. A confirmação do diagnóstico foi realizada com o exame de imuno-histoquímica, que revelou marcação positiva de cistos com bradizoítos de T. gondii no encéfalo e em músculo esquelético. T. gondii deve ser incluído entre as causas de aborto em cabras na região sudeste do Brasil.

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    Ciência Rural
    Article . 2021
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    Ciência Rural
    Article . 2021 . Peer-reviewed
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      Ciência Rural
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    Authors: Jackson Silva Nóbrega; Toshik Iarley da Silva; Ronimeire Torres da Silva; Maria de Fátima de Queiroz Lopes; +2 Authors

    ABSTRACT Salinity is one of the problems that limit plant development, with the germination, growth, and initial establishment stages being the most sensitive to saline stress. Erythrina velutina, popularly known as “mulungu” in Brazil, is a species native to the Caatinga biome, which grows in conditions of soil rich in salts. The damage caused by salinity to the quality of its seeds and the use of techniques that mitigate such effects are little known. Thus, this work aimed to evaluate salicylic acid as a mitigator of saline stress in the physiological quality of mulungu seeds. The quality of two seed lots from two Brazilian states (L1: Mossoró, Rio Grande do Norte, and L2: Pentencostes, Ceará) was evaluated. A completely randomized design in a 2 (seed soaking with salicylic acid (SA) - distilled water and 1.0 mM SA) × 4 (electrical conductivity of irrigation water - ECw - 0.0, 3.0, 6.0 and 9.0 dS m-1) factorial scheme with four replications of 50 seeds each was used. Saline stress reduces the quality of mulungu seeds and seedlings. SA increases the vigor of the seeds, promoting improvements in germination under saline conditions. RESUMO A salinidade é um dos problemas que limitam o desenvolvimento das plantas, sendo as fases de germinação, crescimento e estabelecimento inicial as mais sensíveis ao estresse salino. Erythrina velutina, popularmente conhecida no Brasil como “mulungu”, é uma espécie nativa do bioma Caatinga, que cresce em condições de solo rico em sais. Os danos causados pela salinidade à qualidade de suas sementes e a utilização de técnicas que mitiguem esses efeitos são pouco conhecidos. Assim, o objetivo deste trabalho foi avaliar o ácido salicílico como mitigador do estresse salino na qualidade fisiológica de sementes de mulungu. A qualidade de dois lotes de sementes de dois estados brasileiros (L1: Mossoró, Rio Grande do Norte, e L2: Pentencostes, Ceará) foi avaliada. O delineamento inteiramente casualizado em esquema fatorial 2 (embebição de sementes com ácido salicílico (SA) - água destilada e 1,0 mM SA) × 4 (condutividade elétrica da água de irrigação - ECw - 0,0, 3,0, 6,0 e 9,0 dS m-1) com quatro repetições de 50 sementes cada foi usado. O estresse salino reduz a qualidade das sementes e mudas de mulungu. SA aumenta o vigor das sementes, promovendo melhorias na germinação em condições salinas.

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    Article . 2021
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    Article . 2021
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    Authors: Sulma Vanessa Souza; Érika Rosendo de Sena Gandra; José Francisco dos Reis Neto; Rodrigo Garófallo Garcia;

    Resumo: Objetivou-se analisar os fatores críticos de sucesso na produção de frango de corte sob a ótica do produtor integrado na região da Grande Dourados, Mato Grosso do Sul, Brasil. Metodologicamente, esta pesquisa é caracterizada como sendo descritiva, realizada com uma amostra composta por oito produtores integrados, residentes em municípios distintos: Caarapó, Dourados, Douradina, Glória de Dourados, Itaporã, Rio Brilhante e Vicentina. Para a coleta de dados, utilizou-se um questionário estruturado desenvolvido de acordo com os aspectos: estruturais, mão de obra, gestão administrativa, controle financeiro, biosseguridade e parceria integrada (produtor - agroindústria). Com o intuito de agrupar os produtores com características similares, foi utilizada a análise de cluster, pelo método de agrupamento hierárquico complete linkage. O estudo apontou a existência de dois clusters e os resultados demonstraram que, para o cluster 1, o aspecto biosseguridade (cuidados gerais com a saúde do frango, localização do aviário, isolamento e portaria) é considerado o de maior importância para se manter na atividade, sendo que esse cluster demonstrou pouca importância aos aspectos: mão-de-obra, gestão e controle financeiro. Os produtores do cluster 2 também deram maior importância ao aspecto biosseguridade (apenas para o quesito cama de frango) e pouca importância ao aspecto gestão. Abstract: The objective was to analyze the critical success factors in the production of broilers from the perspective of the integrated producer in the region of Grande Dourados, Mato Grosso do Sul, Brasil. Methodologically, this research is characterized as being descriptive, carried out with a sample composed of 8 integrated producers, residing in different municipalities: Caarapó, Dourados, Douradina, Glória de Dourados, Itaporã, Rio Brilhante, and Vicentina. For data collection, a structured questionnaire was used, developed according to the following aspects: structural, labor, administrative management, financial control, biosecurity, and integrated partnership (producer - agribusiness). To group producers with similar characteristics, cluster analysis was used, using the complete linkage hierarchical grouping method. The study pointed to the existence of two clusters and the results showed that for cluster 1, the aspect of biosecurity (general care for the health of the chicken, location of the poultry, isolation, and entrance) is considered the most important to remain in the activity. This cluster showed little importance to the aspects: hand- workforce, management, and financial control. Cluster 2 producers also gave greater importance to the biosecurity aspect (only for the chicken litter item) and gave little importance to the management aspect.

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    Revista de Economia e Sociologia Rural
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    Revista de Economia e Sociologia Rural
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      Revista de Economia e Sociologia Rural
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    Authors: Lucas Carvalho Gomes Rodrigues; George Azevedo de Queiroz; Elsie Franklin Guimarães;

    RESUMO Peperomia Ruiz & Pav. é o segundo maior gênero de Piperaceae com cerca de 1.600 a 1.700 espécies no mundo, com 177 ocorrentes no Brasil. O objetivo do trabalho foi identificaras espécies de Peperomia Ruiz & Pav. presentes na Reserva Biológica do Tinguá, realizando tratamento taxonômico e comentários. A REBIO do Tinguá é uma Unidade de Conservação Federal de proteção integral, localizada no Estado do Rio de Janeiro e inserida no bioma Mata Atlântica. Foram encontrados 14 táxons na Reserva Biológica do Tinguá: Peperomia alata Ruiz & Pav.; P. catharinae Miq.; P. corcovadensis Gardner; P. dichotoma Regel; P. glabella (Sw.) A. Dietr. var. glabella; P. glabella var. nervulosa (C. DC.) Yunck.; P.glabella var. nigropunctata (Miq.) Dahlst.; P. glazioui C. DC.; P. nitida Dahlst.; P. obtusifolia (L.) A. Dietr.; P. quadrifolia (L.) Kunth; P. rotundifolia (L.) Kunth; P. tetraphylla (G. Forst.) Hook. & Arn.; P. urocarpa Fisch. & C. A. Mey. ABSTRACT Peperomia Ruiz & Pav. is the second largest genus of Piperaceae with about 1,600 to 1,700 species in the world, with greater diversity in the Neotropics and with great representation in Brazil. The objective of the work was to identify as Peperomia Ruiz & Pav. species present in the Reserva Biológica do Tinguá, carrying out taxonomic treatment and comments. The REBIO of Tinguá is a Federal Conservation Unit of Integral Protection, located in the State of Rio de Janeiro and inserted in the Atlantic Forest biome. There have been found 14 taxa in REBIO of Tinguá: Peperomia alata Ruiz & Pav.; P. catharinae Miq.; P. corcovadensis Gardner; P. dichotoma Regel; P. glabella (Sw.) A. Dietr. var. glabella; P. glabella var. nervulosa (C. DC.) Yunck.; P. glabella var. nigropunctata (Miq.) Dahlst.; P. glazioui C. DC.; P. nitida Dahlst.; P. obtusifolia (L.) A. Dietr.; P. quadrifolia (L.) Kunth; P. rotundifolia (L.) Kunth; P. tetraphylla (G. Forst.) Hook. & Arn.; P. urocarpa Fisch. & C. A. Mey.

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    Hoehnea
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    Authors: Sebastião Ferreira Magagnin; Simona Miléo Siqueira; Priscila de Oliveira Moraes; Fabiano Dahlke; +2 Authors

    ABSTRACT: INRAPORC® is a mechanistic, dynamic, and deterministic model system that is used in commercial pig production. However, its use is limited as it requires performance information for animals under ad libitum (AL) feed management, which is not provided at all stages of production. Verification of the INRAPORC® calibrations were conducted in this investigation using data from a small group of animals fed with AL in a laboratory situation, to simulate the mean kinetics of a larger commercial population and generate the correction equations for the predicted body weight (BW), and backfat thickness (BT). Analyses were performed by comparing the predicted and observed data, and by submitting them to prediction calibration curve tests (b0 = 0, and b1 = 1). The obtained curves presented a systematic, fixed effect error (+2.37 mm) for BT. The predicted BW and BT values were corrected using the values of the systematic errors obtained. As a result, 100% of the BW averages observed were contained in the confidence intervals (CI) of the INRAPORC® predicted averages, without the need for corrections, and 78.5% of the actual BT averages were contained in the CI of the averages predicted by the system, after corrections. The INRAPORC® calibrations, based on a small population of animals in laboratory conditions could thus be utilized to make predictions for commercial pig production systems and for value correction procedures for the BW and BT of pig populations that have systematic errors in their prediction validations. RESUMO: O INRAPORC® é um sistema de modelos mecanicista, dinâmico e determinista. Seu uso em sistemas comerciais de produção de suínos é restrito, pois necessita de informações de desempenho de animais sob manejo alimentar à vontade (AV), uma vez que este manejo não é utilizado em todas as fases de produção. Por isso é interessante verificar se a calibração do INRAPORC® baseada em um pequeno grupo de animais AV em situação laboratorial é capaz de simular a cinética média de uma população comercial maior e de subsidiar equações de correção de dados preditos de peso vivo (PV) e espessura de toucinho (ET). As análises foram realizadas comparando os dados preditos e observados sob o teste da curva de calibração da predição (b0=0 e b1=1), as curvas obtidas apresentaram erro sistemático de efeito fixo para a ET de +2,37mm. Os valores preditos de PV e ET foram corrigidos utilizando os valores dos erros sistemáticos obtidos. Como resultado, 100% das médias observadas de PV, estavam contidas nos intervalos de confiança (IC) das médias preditas pelo INRAPORC®, sem necessidade de correções e 78,5% das médias reais de ET estavam contidas nos IC das médias preditas pelo sistema, após as correções. A calibração do INRAPORC® baseada em uma pequena população de animais em situação laboratorial pode ser aplicada para predições de um sistema comercial de criação de suínos, bem como a aplicação do procedimento de correção dos dados preditos de PV e ET nas populações suínas que apresentem erros sistemáticos nas validações preditivas do sistema.

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    Authors: Natália Viveiros Salomão; Geraldo Wilson Fernandes; Rafaella Silva Pereira; Danielle Piuzana Mucida; +3 Authors

    Abstract Fragmentation of natural areas alters the natural landscape, removing native vegetation and creating an anthropic matrix. In order to better understand the consequences of grazing in areas of campo rupestre and forest, the present study aimed to analyze changes in the vegetation of Cerrado and Atlantic Forest, in the Southern Espinhaço, between 1979 and 2015. The vegetation of the study area was identified as arboreal (forest), or herbaceous or shrubby (campo rupestre) by visual classification of a mosaic of aerial photographs from 1979 and the supervised classification of land use from a Landsat 8 image from 2015. Differences in vegetation were analyzed using a transition matrix based on the “Markov model”, which indicated conversions of vegetation classes due to the misuse of land, mainly as pasture. The results indicate the conversion of arboreal vegetation area into areas of exotic herbaceous vegetation, and stability in the area of shrubby vegetation.

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    Floresta e Ambiente
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    Floresta e Ambiente
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    Floresta e Ambiente
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      Floresta e Ambiente
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      Floresta e Ambiente
      Article . 2021 . Peer-reviewed
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      Floresta e Ambiente
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Lucas Molz Lara; Luciano Gebler; Mirabor José Leite Júnior; Alencar Lucas Soares;

    Abstract Brazilian fruit culture has a great influence on the social and economic sector in the most diverse regions of the country, generating employment and income in the exercise of its activities. As it is an activity carried out most often in a manual and conventional manner, fruit culture has a great potential for technological growth, especially when adopting the concepts applied by precision agriculture on the crops of grains, fibers and energy, creating a new segment, Precision Fruit Farming. The present work aims to carry out a bibliographic review on the main trends that have emerged in the last five years on Precision Fruit growing, highlighting its future perspectives and the history of technological evolution. 83 articles were analyzed, classified in different perennial cultures and applications, such as machine learning, remote sensing, robotics, using UAV to obtain different vegetation indexes, among others. Resumo A fruticultura brasileira exerce grande influência sobre o setor social e econômico nas mais diversas regiões do País, gerando emprego e renda no exercício de suas atividades. Por se tratar de uma atividade realizada, na maioria das vezes, de forma manual e convencional, a fruticultura possui grande potencial de crescimento tecnológico, principalmente ao adotar os conceitos aplicados pela agricultura de precisão sobre as culturas de grãos, fibras e energia, criando um novo segmento, a Fruticultura de Precisão. O presente estudo objetivou realizar uma revisão bibliográfica sobre as principais tendências que surgiram nos últimos cinco anos sobre a Fruticultura de Precisão, destacando suas perspectivas futuras e o histórico de evolução tecnológica. Foram analisados 83 artigos, classificados em diferentes culturas perenes e aplicações, como machine learning (aprendizado de máquinas), sensoriamento remoto, robótica, utilização de VANT para obtenção de diferentes índices de vegetação, entre outras.

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    Revista Brasileira de Fruticultura
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    Revista Brasileira de Fruticultura
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      Revista Brasileira de Fruticultura
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      Revista Brasileira de Fruticultura
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    Authors: Dante Teixeira Valente Júnior; Lívia Maria dos Reis Barbosa; Marcos Henrique Soares; Gustavo de Amorim Rodrigues; +6 Authors

    ABSTRACT: Increasing fat deposition and feed conversion ratio over the days in finishing phase directly influence pork quality and productive profitability. Nonetheless, the slaughter of heavier pigs can result in benefits for the slaughterhouse due to dilution of production and processing costs, as well as economic benefits for the pig producer resulting from the dilution of production costs. Therefore, dietary supplementation of chromium for finishing pigs of high lean-genotypes is a strategy to increase lean tissue accretion and minimize fat deposition, reflecting positively on growth performance. This review discussed recent studies results and mechanisms of action of this modifier of performance and carcass a traits in finishing pigs. Chromium increases the insulin action, facilitating insulin binding to the receptors on cell membrane. As a result, insulin-sensitive cells uptake more glucose, which will be later converted into energy. This additional energy is use to increase protein synthesis, thereby increasing the amount of lean tissue and reducing fat content in the carcass, without altering protein intake by pigs. Chromium also reduces lipid oxidation rate maintaining meat quality for longer period. In conclusion, dietary Cr supplementation for finishing pigs have shown that 0.2 mg/kg of organic Cr sources for pigs from ~60 kg until the slaughter can improve growth performance, lean gain and reduce fat content in carcass. However, the development of nanotechnology has allowed the use of inorganic Cr source at 0.2 mg/kg of inclusion, leading to improve the growth performance and carcass traits of finishing pigs. RESUMO: O aumento na deposição de gordura e da conversão alimentar durante a fase de terminação são fatores que implicam diretamente na qualidade da carne e também na rentabilidade da cadeia produtiva. Apesar disso, o abate tardio dos suínos pode resultar em benefícios para o frigorífico, pela redução dos custos operacionais por suíno abatido e melhor utilização dos equipamentos, bem como vantagens econômicas para o produtor resultantes da diluição dos custos de produção. Portanto, a suplementação de cromo na ração de suínos de linhagens com maior potencial para deposição de músculo, é uma estratégia para aumentar a deposição de tecido magro e minimizar a deposição de gordura, refletindo positivamente no desempenho. Em vista disso, objetivou-se com este trabalho, apresentar e discutir os mecanismos de ação, finalidades e resultados recentes de estudos na literatura sobre a suplementação desse modificador de carcaça na ração de suínos em terminação. O principal papel do cromo é potencializar a ação da insulina, facilitando a ligação entre a insulina e os seus receptores na membrana celular. Com isso, as células sensíveis à insulina captam maior quantidade de glicose, que posteriormente serão convertidas em energia. Essa energia adicional pode ser utilizada para aumentar a síntese proteica, aumentando assim, a quantidade de carne magra e reduzindo o teor de gordura na carcaça, sem alterar o consumo de proteína pelos animais. O cromo também diminui a taxa de oxidação lipídica, mantendo a qualidade da carne por mais tempo. Em conclusão, a suplementação dietética de Cr para suínos em terminação mostra que 0,2 mg/kg de fontes orgânicas de Cr para suínos de ~ 60 kg até o abate podem melhorar o desempenho, ganho de massa magra e reduzir o teor de gordura na carcaça. No entanto, o desenvolvimento da nanotecnologia tem permitido o uso de fonte inorgânica de Cr na dose de 0,2 mg/kg de inclusão, melhorando o desempenho e as características de carcaça de suínos em terminação.

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    Ciência Rural
    Article . 2021
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    Ciência Rural
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      Ciência Rural
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    Authors: Diego Costa Farias; Natanael Costa Rebouças; Thales Silva Coutinho; Rayane de Tasso Moreira Ribeiro; +1 Authors

    Abstract This study aimed to carry out a taxonomic floristic survey of species in the genus Ditassa (Asclepiadoideae/Apocynaceae), as part of the “Flora do Ceará: knowing to conserve” project. The study was based on the analysis of morphological characters of specimens from representative herbaria for the genus. The identifications were performed using specialized bibliography and confirmed by analyzing type collections. For Ceará state, six species of Ditassa were registered: D. blanchetii, D. capillaris, D. dardanoi, D. glaziovii, D. hastata and D. hispida. The species occur in Savana (Cerrado), Stepic Savanna (Caatinga/Carrasco), Dense Ombrophilous Forest (Wet forest) and Lowland Semideciduous Seasonal Forest (Tableland forest). Only D. capillaris and D. hastata were recorded in Conservation Units. Resumo Este estudo teve como objetivo realizar o levantamento florístico-taxonômico dos representantes do gênero Ditassa (Asclepiadoideae/Apocynaceae), como parte do projeto “Flora do Ceará: conhecer para conservar”. O estudo se baseou na análise de caracteres morfológicos de espécimes depositados em herbários representativos para o gênero. As identificações foram realizadas com o auxílio de bibliografias especializadas e confirmadas pela análise das coleções-tipo. No estado do Ceará foram registradas seis espécies do gênero Ditassa: D. blanchetii, D. capillaris, D. dardanoi, D. glaziovii, D. hastata e D. hispida. As espécies ocorrem em Savana (Cerrado), Savana Estépica (Caatinga/Carrasco), Floresta Ombrófila Densa (Mata Úmida) e Floresta Estacional Semidecidual de Terras Baixas (Mata de Tabuleiro). Apenas D. capillaris e D. hastata foram registradas em Unidades de Conservação.

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    DOAJ
    Article . 2021
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    https://www.scielo.br/j/rod/a/...
    Article
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    Rodriguésia
    Article . 2021
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    https://doi.org/10.1590/2175-7...
    Article . 2021 . Peer-reviewed
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      Rodriguésia
      Article . 2021
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      https://doi.org/10.1590/2175-7...
      Article . 2021 . Peer-reviewed
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    Authors: Francisco Roberto dos Santos Lima; Marcos Luiz da Silva Apoliano; Davi de Holanda Cavalcante; Marcelo Vinícius Carmo Sá;

    Abstract The present study aimed at determining the effects of dietary DL-methionine supplementation on the water quality, bioflocs composition and Nile tilapia juvenile’s (initial body weight = 2.76 ± 0.06 g) growth performance in BFT rearing tanks (18 fish/100-L tank). Fish were or not subjected to artificial feed restriction. The experimental treatments consisted of two control groups: 1 - no feed restriction, no methionine supplementation; 2 - feed restriction at 25%, no methionine supplementation. There were also four treated groups: 1 - feed restriction at 25%, dietary DL-methionine supplementation at 0.5%; 2 - feed restriction at 25%, dietary DL-methionine supplementation at 1.0%; 3 - feed restriction at 25%, dietary DL-methionine supplementation at 2.0%; 4 - feed restriction at 25%, DL-methionine supplementation of molasses at 1.0. Supplementation of the commercial diet with DL-methionine has not affected either the water quality of the BFT Nile tilapia rearing tanks or the proximate composition of the bioflocs. After 8 weeks, weight gain of fish reared in tanks with feed restriction and dietary DL-methionine supplementation at 1% or 2% has not differed (P>0.05) from the tanks without feed restriction. In conclusion, it is possible to restrict the daily feed allowances of Nile tilapia juveniles reared in BFT tanks at 25%, with no growth performance impairment, if a minimal dietary DL-methionine supplementation of 1.0% is given. Resumo O presente estudo teve por objetivo determinar os efeitos da suplementação da ração balanceada de juvenis de tilápia do Nilo (peso médio inicial = 2,76 ± 0,06 g), submetidos à restrição na oferta de alimento artificial em tanques BFT de cultivo (18 juvenis/tanque 100 L), com DL-metionina, sobre a qualidade da água, composição dos bioflocos e desempenho zootécnico. Os tratamentos experimentais foram constituídos por dois grupos controle (1 - sem restrição alimentar, sem suplementação com metionina; 2 - com restrição alimentar de 25%, sem suplementação com metionina) e quatro tratamentos experimentais (3 - restrição alimentar de 25%, suplementação da ração com 0,5% de DL-metionina, misturada à ração; 4 - restrição alimentar de 25%, suplementação da ração com 1,0% de DL-metionina, misturada à ração; 5 - restrição alimentar de 25%, suplementação da ração com 2,0% de DL-metionina, misturada à ração; 6 - restrição alimentar de 25%, suplementação do melaço em 1,0% de DL-metionina, misturada ao melaço). A suplementação da ração balanceada com DL-metionina não afetou a qualidade da água de cultivo de juvenis de tilápia do Nilo, em tanques BFT, nem a composição centesimal do bioflocos. Após 8 semanas, o ganho em peso corporal dos peixes mantidos nos tanques com restrição alimentar e suplementação da ração com 1% ou 2% de DL-metionina não diferiu (P>0,05) do observado nos tanques sem restrição alimentar. Concluiu-se que é possível restringir as taxas de arraçoamento de juvenis de tilápia do Nilo, mantidos em tanques BFT de cultivo, em 25%, sem prejuízo zootécnico, desde que se faça a suplementação da dieta com, pelo menos, 1% de DL-metionina.

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    Article . 2021
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      Article . 2021
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    Authors: Gabriela Oliveira Pereira; Asheley Henrique Barbosa Pereira; Marilene de Farias Brito; Caroline Argenta Pescador; +1 Authors

    ABSTRACT: Although, serological assays for detecting immune response against Toxoplasma gondii in goats and sheep are frequent in Brazil, studies showing lesions and confirmation of infectious causes of abortion in goats in the state of Rio de Janeiro have not been reported. This study aimed to describe an abortion outbreak caused by T. gondii in a goat herd in the state of Rio de Janeiro. At histological examination, necrotizing encephalitis and lymphoplasmacytic myositis were observed in goat fetuses submitted to necropsy. The diagnoses were confirmed by immunohistochemistry, which revealed positive marking structures compatible with T. gondii bradyzoites in the brain and skeletal muscle cysts. T. gondii should be included among the causes of abortion in goats in the Southeast region of Brazil. RESUMO: Embora sejam frequentes as pesquisas sorológicas da toxoplasmose em caprinos e ovinos no Brasil, os estudos que apresentam as lesões e a confirmação das causas infecciosas de aborto em caprinos no estado do Rio de Janeiro não foram encontrados. Neste trabalho descreve-se Toxoplasma gondii como causa de aborto em uma criação de caprinos no estado do Rio de Janeiro. Ao exame histológico foi observada encefalite necrosante e miosite linfoplasmocítica nos fetos caprinos submetidos à necropsia. A confirmação do diagnóstico foi realizada com o exame de imuno-histoquímica, que revelou marcação positiva de cistos com bradizoítos de T. gondii no encéfalo e em músculo esquelético. T. gondii deve ser incluído entre as causas de aborto em cabras na região sudeste do Brasil.

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    Ciência Rural
    Article . 2021
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    Ciência Rural
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    Ciência Rural
    Article . 2021 . Peer-reviewed
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    Article . 2021
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      Ciência Rural
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    Authors: Jackson Silva Nóbrega; Toshik Iarley da Silva; Ronimeire Torres da Silva; Maria de Fátima de Queiroz Lopes; +2 Authors

    ABSTRACT Salinity is one of the problems that limit plant development, with the germination, growth, and initial establishment stages being the most sensitive to saline stress. Erythrina velutina, popularly known as “mulungu” in Brazil, is a species native to the Caatinga biome, which grows in conditions of soil rich in salts. The damage caused by salinity to the quality of its seeds and the use of techniques that mitigate such effects are little known. Thus, this work aimed to evaluate salicylic acid as a mitigator of saline stress in the physiological quality of mulungu seeds. The quality of two seed lots from two Brazilian states (L1: Mossoró, Rio Grande do Norte, and L2: Pentencostes, Ceará) was evaluated. A completely randomized design in a 2 (seed soaking with salicylic acid (SA) - distilled water and 1.0 mM SA) × 4 (electrical conductivity of irrigation water - ECw - 0.0, 3.0, 6.0 and 9.0 dS m-1) factorial scheme with four replications of 50 seeds each was used. Saline stress reduces the quality of mulungu seeds and seedlings. SA increases the vigor of the seeds, promoting improvements in germination under saline conditions. RESUMO A salinidade é um dos problemas que limitam o desenvolvimento das plantas, sendo as fases de germinação, crescimento e estabelecimento inicial as mais sensíveis ao estresse salino. Erythrina velutina, popularmente conhecida no Brasil como “mulungu”, é uma espécie nativa do bioma Caatinga, que cresce em condições de solo rico em sais. Os danos causados pela salinidade à qualidade de suas sementes e a utilização de técnicas que mitiguem esses efeitos são pouco conhecidos. Assim, o objetivo deste trabalho foi avaliar o ácido salicílico como mitigador do estresse salino na qualidade fisiológica de sementes de mulungu. A qualidade de dois lotes de sementes de dois estados brasileiros (L1: Mossoró, Rio Grande do Norte, e L2: Pentencostes, Ceará) foi avaliada. O delineamento inteiramente casualizado em esquema fatorial 2 (embebição de sementes com ácido salicílico (SA) - água destilada e 1,0 mM SA) × 4 (condutividade elétrica da água de irrigação - ECw - 0,0, 3,0, 6,0 e 9,0 dS m-1) com quatro repetições de 50 sementes cada foi usado. O estresse salino reduz a qualidade das sementes e mudas de mulungu. SA aumenta o vigor das sementes, promovendo melhorias na germinação em condições salinas.

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    Authors: Sulma Vanessa Souza; Érika Rosendo de Sena Gandra; José Francisco dos Reis Neto; Rodrigo Garófallo Garcia;

    Resumo: Objetivou-se analisar os fatores críticos de sucesso na produção de frango de corte sob a ótica do produtor integrado na região da Grande Dourados, Mato Grosso do Sul, Brasil. Metodologicamente, esta pesquisa é caracterizada como sendo descritiva, realizada com uma amostra composta por oito produtores integrados, residentes em municípios distintos: Caarapó, Dourados, Douradina, Glória de Dourados, Itaporã, Rio Brilhante e Vicentina. Para a coleta de dados, utilizou-se um questionário estruturado desenvolvido de acordo com os aspectos: estruturais, mão de obra, gestão administrativa, controle financeiro, biosseguridade e parceria integrada (produtor - agroindústria). Com o intuito de agrupar os produtores com características similares, foi utilizada a análise de cluster, pelo método de agrupamento hierárquico complete linkage. O estudo apontou a existência de dois clusters e os resultados demonstraram que, para o cluster 1, o aspecto biosseguridade (cuidados gerais com a saúde do frango, localização do aviário, isolamento e portaria) é considerado o de maior importância para se manter na atividade, sendo que esse cluster demonstrou pouca importância aos aspectos: mão-de-obra, gestão e controle financeiro. Os produtores do cluster 2 também deram maior importância ao aspecto biosseguridade (apenas para o quesito cama de frango) e pouca importância ao aspecto gestão. Abstract: The objective was to analyze the critical success factors in the production of broilers from the perspective of the integrated producer in the region of Grande Dourados, Mato Grosso do Sul, Brasil. Methodologically, this research is characterized as being descriptive, carried out with a sample composed of 8 integrated producers, residing in different municipalities: Caarapó, Dourados, Douradina, Glória de Dourados, Itaporã, Rio Brilhante, and Vicentina. For data collection, a structured questionnaire was used, developed according to the following aspects: structural, labor, administrative management, financial control, biosecurity, and integrated partnership (producer - agribusiness). To group producers with similar characteristics, cluster analysis was used, using the complete linkage hierarchical grouping method. The study pointed to the existence of two clusters and the results showed that for cluster 1, the aspect of biosecurity (general care for the health of the chicken, location of the poultry, isolation, and entrance) is considered the most important to remain in the activity. This cluster showed little importance to the aspects: hand- workforce, management, and financial control. Cluster 2 producers also gave greater importance to the biosecurity aspect (only for the chicken litter item) and gave little importance to the management aspect.

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    Revista de Economia e Sociologia Rural
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    Revista de Economia e Sociologia Rural
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    Authors: Lucas Carvalho Gomes Rodrigues; George Azevedo de Queiroz; Elsie Franklin Guimarães;

    RESUMO Peperomia Ruiz & Pav. é o segundo maior gênero de Piperaceae com cerca de 1.600 a 1.700 espécies no mundo, com 177 ocorrentes no Brasil. O objetivo do trabalho foi identificaras espécies de Peperomia Ruiz & Pav. presentes na Reserva Biológica do Tinguá, realizando tratamento taxonômico e comentários. A REBIO do Tinguá é uma Unidade de Conservação Federal de proteção integral, localizada no Estado do Rio de Janeiro e inserida no bioma Mata Atlântica. Foram encontrados 14 táxons na Reserva Biológica do Tinguá: Peperomia alata Ruiz & Pav.; P. catharinae Miq.; P. corcovadensis Gardner; P. dichotoma Regel; P. glabella (Sw.) A. Dietr. var. glabella; P. glabella var. nervulosa (C. DC.) Yunck.; P.glabella var. nigropunctata (Miq.) Dahlst.; P. glazioui C. DC.; P. nitida Dahlst.; P. obtusifolia (L.) A. Dietr.; P. quadrifolia (L.) Kunth; P. rotundifolia (L.) Kunth; P. tetraphylla (G. Forst.) Hook. & Arn.; P. urocarpa Fisch. & C. A. Mey. ABSTRACT Peperomia Ruiz & Pav. is the second largest genus of Piperaceae with about 1,600 to 1,700 species in the world, with greater diversity in the Neotropics and with great representation in Brazil. The objective of the work was to identify as Peperomia Ruiz & Pav. species present in the Reserva Biológica do Tinguá, carrying out taxonomic treatment and comments. The REBIO of Tinguá is a Federal Conservation Unit of Integral Protection, located in the State of Rio de Janeiro and inserted in the Atlantic Forest biome. There have been found 14 taxa in REBIO of Tinguá: Peperomia alata Ruiz & Pav.; P. catharinae Miq.; P. corcovadensis Gardner; P. dichotoma Regel; P. glabella (Sw.) A. Dietr. var. glabella; P. glabella var. nervulosa (C. DC.) Yunck.; P. glabella var. nigropunctata (Miq.) Dahlst.; P. glazioui C. DC.; P. nitida Dahlst.; P. obtusifolia (L.) A. Dietr.; P. quadrifolia (L.) Kunth; P. rotundifolia (L.) Kunth; P. tetraphylla (G. Forst.) Hook. & Arn.; P. urocarpa Fisch. & C. A. Mey.

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    Authors: Sebastião Ferreira Magagnin; Simona Miléo Siqueira; Priscila de Oliveira Moraes; Fabiano Dahlke; +2 Authors

    ABSTRACT: INRAPORC® is a mechanistic, dynamic, and deterministic model system that is used in commercial pig production. However, its use is limited as it requires performance information for animals under ad libitum (AL) feed management, which is not provided at all stages of production. Verification of the INRAPORC® calibrations were conducted in this investigation using data from a small group of animals fed with AL in a laboratory situation, to simulate the mean kinetics of a larger commercial population and generate the correction equations for the predicted body weight (BW), and backfat thickness (BT). Analyses were performed by comparing the predicted and observed data, and by submitting them to prediction calibration curve tests (b0 = 0, and b1 = 1). The obtained curves presented a systematic, fixed effect error (+2.37 mm) for BT. The predicted BW and BT values were corrected using the values of the systematic errors obtained. As a result, 100% of the BW averages observed were contained in the confidence intervals (CI) of the INRAPORC® predicted averages, without the need for corrections, and 78.5% of the actual BT averages were contained in the CI of the averages predicted by the system, after corrections. The INRAPORC® calibrations, based on a small population of animals in laboratory conditions could thus be utilized to make predictions for commercial pig production systems and for value correction procedures for the BW and BT of pig populations that have systematic errors in their prediction validations. RESUMO: O INRAPORC® é um sistema de modelos mecanicista, dinâmico e determinista. Seu uso em sistemas comerciais de produção de suínos é restrito, pois necessita de informações de desempenho de animais sob manejo alimentar à vontade (AV), uma vez que este manejo não é utilizado em todas as fases de produção. Por isso é interessante verificar se a calibração do INRAPORC® baseada em um pequeno grupo de animais AV em situação laboratorial é capaz de simular a cinética média de uma população comercial maior e de subsidiar equações de correção de dados preditos de peso vivo (PV) e espessura de toucinho (ET). As análises foram realizadas comparando os dados preditos e observados sob o teste da curva de calibração da predição (b0=0 e b1=1), as curvas obtidas apresentaram erro sistemático de efeito fixo para a ET de +2,37mm. Os valores preditos de PV e ET foram corrigidos utilizando os valores dos erros sistemáticos obtidos. Como resultado, 100% das médias observadas de PV, estavam contidas nos intervalos de confiança (IC) das médias preditas pelo INRAPORC®, sem necessidade de correções e 78,5% das médias reais de ET estavam contidas nos IC das médias preditas pelo sistema, após as correções. A calibração do INRAPORC® baseada em uma pequena população de animais em situação laboratorial pode ser aplicada para predições de um sistema comercial de criação de suínos, bem como a aplicação do procedimento de correção dos dados preditos de PV e ET nas populações suínas que apresentem erros sistemáticos nas validações preditivas do sistema.

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    Ciência Rural
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      Ciência Rural
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    Authors: Natália Viveiros Salomão; Geraldo Wilson Fernandes; Rafaella Silva Pereira; Danielle Piuzana Mucida; +3 Authors

    Abstract Fragmentation of natural areas alters the natural landscape, removing native vegetation and creating an anthropic matrix. In order to better understand the consequences of grazing in areas of campo rupestre and forest, the present study aimed to analyze changes in the vegetation of Cerrado and Atlantic Forest, in the Southern Espinhaço, between 1979 and 2015. The vegetation of the study area was identified as arboreal (forest), or herbaceous or shrubby (campo rupestre) by visual classification of a mosaic of aerial photographs from 1979 and the supervised classification of land use from a Landsat 8 image from 2015. Differences in vegetation were analyzed using a transition matrix based on the “Markov model”, which indicated conversions of vegetation classes due to the misuse of land, mainly as pasture. The results indicate the conversion of arboreal vegetation area into areas of exotic herbaceous vegetation, and stability in the area of shrubby vegetation.

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