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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
21/08/2023 |
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Data da última atualização: |
21/08/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MAIA, G. G.; SIQUEIRA, L. G. B.; VASCONCELOS, C. O. de P.; TOMICH, T. R.; CAMARGO, L. S. de A.; RODRIGUES, J. P. P.; MENEZES, R. A. de; GONÇALVES, L. C.; TEIXEIRA, B. F.; GRANDO, R. de O.; NOGUEIRA, L. A. G.; PEREIRA, L. G. R. |
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Afiliação: |
GILSON GONÇALVES MAIA, Universidade Federal Fluminense; LUIZ GUSTAVO BRUNO SIQUEIRA, CNPGL; CARLOS OTÁVIO DE PAULA VASCONCELOS, Universidade Federal Fluminense; THIERRY RIBEIRO TOMICH, CNPGL; LUIZ SERGIO DE ALMEIDA CAMARGO, CNPGL; JOÃO PAULO PACHECO RODRIGUES, Universidade Federal do Sul e Sudeste do Pará; RAFAEL ARAÚJO DE MENEZES, Universidade Federal de Minas Gerais; LÚCIO CARLOS GONÇALVES, Universidade Federal de Minas Gerais; BRIDA FAGGION TEIXEIRA, Instituto de Desenvolvimento do Alto Uruguai; RODRIGO DE OLIVEIRA GRANDO, Instituto de Desenvolvimento do Alto Uruguai; LUIZ ALTAMIRO GARCIA NOGUEIRA, Universidade Federal Fluminense; LUIZ GUSTAVO RIBEIRO PEREIRA, CNPGL. |
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Título: |
Effects of heat stress on rumination activity in Holstein-Gyr dry cows. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Livestock Science, v. 239, 104092, 2020. |
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DOI: |
https://doi.org/10.1016/j.livsci.2020.104092 |
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Idioma: |
Inglês |
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Conteúdo: |
The objective of this study was to evaluate the effects of heat stress (HS) on: i) time and daily pattern of rumination and ii) in situ degradability in Holstein-Gyr crossbred dry cows. Nine cows, weighing 556.2 ± 97.1 kg were housed in a climate chamber (average THI=83.1) or a freestall barn (average THI=66.5) randomly assigned to treatments in a crossover design. Cows were fed corn silage ad libitum and 1 kg of concentrate as a maintenance diet. To measure rumination, we used a sensor attached to a collar. The in situ ruminal degradability was evaluated by incubation of concentrate, silage, and diet samples into the rumen of a fistulated cow for 6, 24, 48 and 96 h. The RT was affected by HS (P<0.001) and time of the day (P<0.001). The rumination pattern for control and HS cows had a first peak at approximately 04:00h and the magnitude of this peak in HS was 22.9% less than controls. The second RT peak occurred in the evening (~20:00h), when RT in HS was 27.8% less compared with controls. We observed a reduction in dry matter digestibility (DMD) of concentrate (85.1% vs 77.8%, control and HS, respectively; P<0,05) and also in the slow-degradable fraction of concentrate (93.9% vs 85.1%, respectively; P<0,05). Finally, DMD of the diet reduced from 73% to 70% for animals exposed to HS compared to controls. In conclusion, HS negatively affected e rumination time and in situ ruminal degradability in dry dairy cows. |
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Palavras-Chave: |
Câmara climatizada; Cinética ruminal; THI. |
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Thesagro: |
Bovino; Digestibilidade; Gado Gir; Gado Holandês; Vaca Leiteira. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02477naa a2200361 a 4500
001 2156008
005 2023-08-21
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.livsci.2020.104092$2DOI
100 1 $aMAIA, G. G.
245 $aEffects of heat stress on rumination activity in Holstein-Gyr dry cows.$h[electronic resource]
260 $c2020
520 $aThe objective of this study was to evaluate the effects of heat stress (HS) on: i) time and daily pattern of rumination and ii) in situ degradability in Holstein-Gyr crossbred dry cows. Nine cows, weighing 556.2 ± 97.1 kg were housed in a climate chamber (average THI=83.1) or a freestall barn (average THI=66.5) randomly assigned to treatments in a crossover design. Cows were fed corn silage ad libitum and 1 kg of concentrate as a maintenance diet. To measure rumination, we used a sensor attached to a collar. The in situ ruminal degradability was evaluated by incubation of concentrate, silage, and diet samples into the rumen of a fistulated cow for 6, 24, 48 and 96 h. The RT was affected by HS (P<0.001) and time of the day (P<0.001). The rumination pattern for control and HS cows had a first peak at approximately 04:00h and the magnitude of this peak in HS was 22.9% less than controls. The second RT peak occurred in the evening (~20:00h), when RT in HS was 27.8% less compared with controls. We observed a reduction in dry matter digestibility (DMD) of concentrate (85.1% vs 77.8%, control and HS, respectively; P<0,05) and also in the slow-degradable fraction of concentrate (93.9% vs 85.1%, respectively; P<0,05). Finally, DMD of the diet reduced from 73% to 70% for animals exposed to HS compared to controls. In conclusion, HS negatively affected e rumination time and in situ ruminal degradability in dry dairy cows.
650 $aBovino
650 $aDigestibilidade
650 $aGado Gir
650 $aGado Holandês
650 $aVaca Leiteira
653 $aCâmara climatizada
653 $aCinética ruminal
653 $aTHI
700 1 $aSIQUEIRA, L. G. B.
700 1 $aVASCONCELOS, C. O. de P.
700 1 $aTOMICH, T. R.
700 1 $aCAMARGO, L. S. de A.
700 1 $aRODRIGUES, J. P. P.
700 1 $aMENEZES, R. A. de
700 1 $aGONÇALVES, L. C.
700 1 $aTEIXEIRA, B. F.
700 1 $aGRANDO, R. de O.
700 1 $aNOGUEIRA, L. A. G.
700 1 $aPEREIRA, L. G. R.
773 $tLivestock Science$gv. 239, 104092, 2020.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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