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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
01/06/2020 |
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Data da última atualização: |
01/06/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GOMES, F. de K.; HOMEM. B. G. C.; OLIVEIRA, M. D. B. L de; DUBEUX, J. C. B.; BODDEY, R. M.; BERNARDES, T. F.; CASAGRANDE, D. R. |
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Afiliação: |
FERNANDA DE KÁSSIA GOMES B, UFLA; BRUNO GROSSI COSTA HOMEM, UFLA; UFLA; University of Florida, USA; ROBERT MICHAEL BODDEY, CNPAB; UFLA; UFLA. |
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Título: |
Defoliation frequency affects litter responses and nitrogen excretion by heifers in palisadegrass?forage peanut pastures. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Agronomy Journal, v., p. 1-12, 2020 |
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ISSN: |
1435-0645 |
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DOI: |
DOI: 10.1002/agj2.20240 |
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Idioma: |
Inglês |
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Conteúdo: |
Legumes can contribute significantly to nitrogen (N) input in grazing systems. Grazing management is a critical factor affecting N cycling in mixed pastures, altering the legume N input as a result. This study assessed how defoliation frequency affects N cycling inrotationally stocked palisadegrass (Brachiariabrizantha)and forage peanut (Arachis pintoi) pastures. Treatments included four grazing management strategies, defined by the rest period interruption when the canopy reached 90 (90LI), 95 (95LI), and 100% (100LI) of photosynthetically active radiation interception (LI), and a fixed rest period of 42 d (42D). A 2-yr experimental period was adopted. Existing litter was greater at 100LI (2208 vs. 1964 kg ha−1; average of 42D, 90LI, and 95LI, respectively). Greater defoliation frequency (42D and 90LI) resulted in increase of litter legume proportion, resulting in greater decomposition rate, lower litter halflife (p < .001, and p = .015, respectively), and greater N cycling (91 vs. 64 kg ha−1 season−1). Less frequent defoliation (100LI) resulted in reduced total forage intake, proportion of legume intake, and lower N intake compared with other treatments (p= .007, p= .081, and p < .001, respectively). Greater defoliation frequency increased N cycling via litter, but did not affect excretion due to compensation with stocking rate. Defoliation frequency between 90 and 95% LI optimizes N cycling in palisadegrass-forage peanut mixed pastures. |
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Thesagro: |
Brachiaria sp. |
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Thesaurus Nal: |
Arachis pintoi. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02201naa a2200241 a 4500
001 2122865
005 2020-06-01
008 2020 bl uuuu u00u1 u #d
022 $a1435-0645
024 7 $aDOI: 10.1002/agj2.20240$2DOI
100 1 $aGOMES, F. de K.
245 $aDefoliation frequency affects litter responses and nitrogen excretion by heifers in palisadegrass?forage peanut pastures.
260 $c2020
520 $aLegumes can contribute significantly to nitrogen (N) input in grazing systems. Grazing management is a critical factor affecting N cycling in mixed pastures, altering the legume N input as a result. This study assessed how defoliation frequency affects N cycling inrotationally stocked palisadegrass (Brachiariabrizantha)and forage peanut (Arachis pintoi) pastures. Treatments included four grazing management strategies, defined by the rest period interruption when the canopy reached 90 (90LI), 95 (95LI), and 100% (100LI) of photosynthetically active radiation interception (LI), and a fixed rest period of 42 d (42D). A 2-yr experimental period was adopted. Existing litter was greater at 100LI (2208 vs. 1964 kg ha−1; average of 42D, 90LI, and 95LI, respectively). Greater defoliation frequency (42D and 90LI) resulted in increase of litter legume proportion, resulting in greater decomposition rate, lower litter halflife (p < .001, and p = .015, respectively), and greater N cycling (91 vs. 64 kg ha−1 season−1). Less frequent defoliation (100LI) resulted in reduced total forage intake, proportion of legume intake, and lower N intake compared with other treatments (p= .007, p= .081, and p < .001, respectively). Greater defoliation frequency increased N cycling via litter, but did not affect excretion due to compensation with stocking rate. Defoliation frequency between 90 and 95% LI optimizes N cycling in palisadegrass-forage peanut mixed pastures.
650 $aArachis pintoi
650 $aBrachiaria sp
700 1 $aHOMEM. B. G. C.
700 1 $aOLIVEIRA, M. D. B. L de
700 1 $aDUBEUX, J. C. B.
700 1 $aBODDEY, R. M.
700 1 $aBERNARDES, T. F.
700 1 $aCASAGRANDE, D. R.
773 $tAgronomy Journal$gv., p. 1-12, 2020
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
20/09/2018 |
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Data da última atualização: |
25/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
LIMA, C. C. V. de; AYRES, M. C. C.; PINHEIRO, R. R.; COSTA, N. C.; SOUZA, T. S. de; ANDRIOLI, A.; AZEVEDO, D. A. A.; SANTOS, V. W. S. dos. |
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Afiliação: |
Carla Caroline Valença de Lima, Universidade Federal do Recôncavo da Bahia (UFRB) - Santo Antônio de Jesus, BA, Brasil.; Maria Consuêlo Caribé Ayres, Universidade Federal da Bahia (UFBA) - Salvador, BA, Brasil; RAYMUNDO RIZALDO PINHEIRO, CNPC; Joselito Nunes Costa, Universidade Federal do Recôncavo da Bahia (UFRB) - Cruz das Almas, BA, Brasil; Thiago Sampaio de Souza, Universidade Federal do Recôncavo da Bahia (UFRB) - Cruz das Almas, BA, Brasil; ALICE ANDRIOLI, CNPC; Dalva Alana Aragão Azevedo, Universidade Estadual do Ceará (UECE) - Fortaleza, CE, Brasil.; Vanderlan Warlington Souza dos Santos, Universidade Federal Rural do Semi-Árido (UFERSA) - Mossoró, RN, Brasil. |
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Título: |
Transmission of caprine arthritis encephalitis virus between sheep. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Ciência Rural, v. 48, n. 10, e20180053, 2018. |
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DOI: |
http://dx.doi.org/10.1590/0103-8478cr20180053 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: This study was conducted to evaluate caprine arthritis encephalitis virus (CAEV) transmission among sheep using 15 lambs that were distributed in 2 experimental groups. The exposed group consisted of 10 lambs that remained with their mothers, who were experimentally infected with CAEV. The non-exposed group was characterized as the control group and was comprised of 5 lambs that remained with their CAEV-negative mothers. Blood samples were collected monthly from birth until 1 year of life. To evaluate the transmission, an agar gel immunodiffusion test (AGID), enzyme immunoassay (ELISA), immunoblotting (IB), and nested polymerase chain reaction (nPCR) techniques were used. The non-exposed group was negative in all of the tests throughout the whole experiment. In the exposed group, 2 individuals had positive nPCR results. Positive nPCR samples were sequenced for comparison with the original goat strains and were shown to be similar to the CAEV-Cork strain. Seroconversion was not detected, and clinical manifestations were not observed. Thus, after 1 year of observation, it was verified that CAEV transmission among sheep is possible; however, with discreet frequency. This was an initial study, and other experiments are needed to analyze the adaptive capacity of the CAEV to remain in an infected sheep flock and cause the disease. [Transmissão do vírus da artrite encefalite caprina entre ovinos]. Resumo: O estudo foi conduzido para avaliar a transmissão do vírus da artrite encefalite caprina (CAEV) entre ovinos, utilizando 15 cordeiros, distribuídos em dois grupos experimentais. O grupo exposto foi constituído por 10 cordeiros, mantidos com suas mães, que foram infectadas, experimentalmente, com CAEV. O grupo não exposto caracterizou-se como grupo controle e foi formado por cinco cordeiros, mantidos com suas matrizes, negativas para CAEV. Foram colhidas amostras de sangue mensalmente, do periodo que compreende o nascimento até um ano de vida. Para avaliar a transmissão, foram utilizadas as técnicas de imunodifusão em gel de agarose (IDGA), ensaio imunoenzimático (ELISA), immunoblotting (IB) e reação em cadeia da polimerase do tipo nested (nPCR). O grupo não exposto se manteve negativo aos testes durante todo o experimento. Já no grupo exposto, dois indivíduos apresentaram resultados positivos na nPCR. As amostras positivas na nPCR foram sequenciadas para serem comparadas com as cepas originais de caprinos, comprovando se tratar de lentivírus semelhante à cepa CAEV-Cork. A soroconversão não foi detectada e a manifestação clínica não foi observada. Sendo assim, após um ano de observação, verificou-se que a transmissão do CAEV entre ovinos é possível, entretanto, com discreta frequência. Este foi um estudo inicial, e outros experimentos são necessários para analisar a capacidade adaptativa do CAEV de permanecer em rebanho ovino infectado e, com isso, causar doença. MenosAbstract: This study was conducted to evaluate caprine arthritis encephalitis virus (CAEV) transmission among sheep using 15 lambs that were distributed in 2 experimental groups. The exposed group consisted of 10 lambs that remained with their mothers, who were experimentally infected with CAEV. The non-exposed group was characterized as the control group and was comprised of 5 lambs that remained with their CAEV-negative mothers. Blood samples were collected monthly from birth until 1 year of life. To evaluate the transmission, an agar gel immunodiffusion test (AGID), enzyme immunoassay (ELISA), immunoblotting (IB), and nested polymerase chain reaction (nPCR) techniques were used. The non-exposed group was negative in all of the tests throughout the whole experiment. In the exposed group, 2 individuals had positive nPCR results. Positive nPCR samples were sequenced for comparison with the original goat strains and were shown to be similar to the CAEV-Cork strain. Seroconversion was not detected, and clinical manifestations were not observed. Thus, after 1 year of observation, it was verified that CAEV transmission among sheep is possible; however, with discreet frequency. This was an initial study, and other experiments are needed to analyze the adaptive capacity of the CAEV to remain in an infected sheep flock and cause the disease. [Transmissão do vírus da artrite encefalite caprina entre ovinos]. Resumo: O estudo foi conduzido para avaliar a transmissão do vírus da artri... Mostrar Tudo |
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Palavras-Chave: |
CAEV; Intra-species transmission; Lentivirose; LVPR; MVV; Transmissão intra-espécie. |
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Thesagro: |
Cordeiro; Doença Animal; Ovino; Transmissão de Doença. |
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Thesaurus NAL: |
Caprine arthritis encephalitis virus; Disease transmission; Lambs; Maedi-visna disease; Ovine lentivirus; Sheep diseases; Virus transmission. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/183281/1/CNPC-2018-Transmission.pdf
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Marc: |
LEADER 04152naa a2200421 a 4500
001 2096081
005 2024-01-25
008 2018 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1590/0103-8478cr20180053$2DOI
100 1 $aLIMA, C. C. V. de
245 $aTransmission of caprine arthritis encephalitis virus between sheep.$h[electronic resource]
260 $c2018
520 $aAbstract: This study was conducted to evaluate caprine arthritis encephalitis virus (CAEV) transmission among sheep using 15 lambs that were distributed in 2 experimental groups. The exposed group consisted of 10 lambs that remained with their mothers, who were experimentally infected with CAEV. The non-exposed group was characterized as the control group and was comprised of 5 lambs that remained with their CAEV-negative mothers. Blood samples were collected monthly from birth until 1 year of life. To evaluate the transmission, an agar gel immunodiffusion test (AGID), enzyme immunoassay (ELISA), immunoblotting (IB), and nested polymerase chain reaction (nPCR) techniques were used. The non-exposed group was negative in all of the tests throughout the whole experiment. In the exposed group, 2 individuals had positive nPCR results. Positive nPCR samples were sequenced for comparison with the original goat strains and were shown to be similar to the CAEV-Cork strain. Seroconversion was not detected, and clinical manifestations were not observed. Thus, after 1 year of observation, it was verified that CAEV transmission among sheep is possible; however, with discreet frequency. This was an initial study, and other experiments are needed to analyze the adaptive capacity of the CAEV to remain in an infected sheep flock and cause the disease. [Transmissão do vírus da artrite encefalite caprina entre ovinos]. Resumo: O estudo foi conduzido para avaliar a transmissão do vírus da artrite encefalite caprina (CAEV) entre ovinos, utilizando 15 cordeiros, distribuídos em dois grupos experimentais. O grupo exposto foi constituído por 10 cordeiros, mantidos com suas mães, que foram infectadas, experimentalmente, com CAEV. O grupo não exposto caracterizou-se como grupo controle e foi formado por cinco cordeiros, mantidos com suas matrizes, negativas para CAEV. Foram colhidas amostras de sangue mensalmente, do periodo que compreende o nascimento até um ano de vida. Para avaliar a transmissão, foram utilizadas as técnicas de imunodifusão em gel de agarose (IDGA), ensaio imunoenzimático (ELISA), immunoblotting (IB) e reação em cadeia da polimerase do tipo nested (nPCR). O grupo não exposto se manteve negativo aos testes durante todo o experimento. Já no grupo exposto, dois indivíduos apresentaram resultados positivos na nPCR. As amostras positivas na nPCR foram sequenciadas para serem comparadas com as cepas originais de caprinos, comprovando se tratar de lentivírus semelhante à cepa CAEV-Cork. A soroconversão não foi detectada e a manifestação clínica não foi observada. Sendo assim, após um ano de observação, verificou-se que a transmissão do CAEV entre ovinos é possível, entretanto, com discreta frequência. Este foi um estudo inicial, e outros experimentos são necessários para analisar a capacidade adaptativa do CAEV de permanecer em rebanho ovino infectado e, com isso, causar doença.
650 $aCaprine arthritis encephalitis virus
650 $aDisease transmission
650 $aLambs
650 $aMaedi-visna disease
650 $aOvine lentivirus
650 $aSheep diseases
650 $aVirus transmission
650 $aCordeiro
650 $aDoença Animal
650 $aOvino
650 $aTransmissão de Doença
653 $aCAEV
653 $aIntra-species transmission
653 $aLentivirose
653 $aLVPR
653 $aMVV
653 $aTransmissão intra-espécie
700 1 $aAYRES, M. C. C.
700 1 $aPINHEIRO, R. R.
700 1 $aCOSTA, N. C.
700 1 $aSOUZA, T. S. de
700 1 $aANDRIOLI, A.
700 1 $aAZEVEDO, D. A. A.
700 1 $aSANTOS, V. W. S. dos
773 $tCiência Rural$gv. 48, n. 10, e20180053, 2018.
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