Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Semina. Ciências Agrárias (Online) |
Texto Completo: | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/21028 |
Resumo: | Genetics differences between breeds may determine the tolerance to high temperature, effect dry matter intake and consequently cattle performance. The effect of temperature and humidity index (THI) on diurnal, nocturnal and daily intake, water intake, physiologic parameters and behavior of Nellore (B. indicus) and Angus (B. taurus) bulls were evaluated. Eight Angus and eight Nellore young bulls (337±7.4 kg and 16 months of age) were allocated in two climate-controlled rooms for 32 days. In the period 1, all bulls were housed in thermoneutral conditions (TN, THI = 72.6) for 10 days. In period 2 (10 days), four Angus and four Nellore bulls were subjected to low heat stress (LHS, THI = 76.4) in daytime, and four Angus and four Nellore bulls were subjected to high heat stress (HHS, THI = 81.5) in daytime. The diurnal and daily dry matter intake (DMI) of Nellore were not affected (P>0.05) by heat stress. However, Angus bulls decreased diurnal DMI by 24% and daily DMI decreased (P<0.05) by 15% on HHS. In TN Angus bulls had higher (P<0.05) daily DMI (36.2 g/kg of BW) than Nellore (29.1 g/kg of BW), but in HHS they had similar (P>0.05) daily DMI (31.6 and 30.2 g/kg of BW, respectively). We observed an increase (P<0.05) in respiratory frequency, but water intake was not affected (P>0.05) by heat stress. The heart rate decreased (P<0.05) with heat stress. No differences were found (P>0.05) in feeding behavior. Therefore, THI stress threshold should distinct for Angus and Nellore bulls. The use of feed intake information may improve the prediction of thermic discomfort on specific climate condition. |
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Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stressConsumo, parâmetros fisiológicos e comportamento de tourinhos Angus e Nelore submetidos a estresse por calorBeef cattleIntake regulationTemperature.Bovinos de corteRegulação do consumoTemperatura.Genetics differences between breeds may determine the tolerance to high temperature, effect dry matter intake and consequently cattle performance. The effect of temperature and humidity index (THI) on diurnal, nocturnal and daily intake, water intake, physiologic parameters and behavior of Nellore (B. indicus) and Angus (B. taurus) bulls were evaluated. Eight Angus and eight Nellore young bulls (337±7.4 kg and 16 months of age) were allocated in two climate-controlled rooms for 32 days. In the period 1, all bulls were housed in thermoneutral conditions (TN, THI = 72.6) for 10 days. In period 2 (10 days), four Angus and four Nellore bulls were subjected to low heat stress (LHS, THI = 76.4) in daytime, and four Angus and four Nellore bulls were subjected to high heat stress (HHS, THI = 81.5) in daytime. The diurnal and daily dry matter intake (DMI) of Nellore were not affected (P>0.05) by heat stress. However, Angus bulls decreased diurnal DMI by 24% and daily DMI decreased (P<0.05) by 15% on HHS. In TN Angus bulls had higher (P<0.05) daily DMI (36.2 g/kg of BW) than Nellore (29.1 g/kg of BW), but in HHS they had similar (P>0.05) daily DMI (31.6 and 30.2 g/kg of BW, respectively). We observed an increase (P<0.05) in respiratory frequency, but water intake was not affected (P>0.05) by heat stress. The heart rate decreased (P<0.05) with heat stress. No differences were found (P>0.05) in feeding behavior. Therefore, THI stress threshold should distinct for Angus and Nellore bulls. The use of feed intake information may improve the prediction of thermic discomfort on specific climate condition. Diferenças genéticas entre raças podem determinar a tolerância a temperaturas elevadas, afetar o consumo de alimentos e consequentemente o desempenho de bovinos. Avaliou-se o efeito do índice de temperatura e umidade (ITU) sobre o consumo diurno, noturno e diário de matéria seca (MS), ingestão diária de água, parâmetros fisiológicos e comportamento de tourinhos da raça Nelore (Bos indicus) e da raça Angus (Bos taurus). Foram utilizados oito tourinhos da raça Nelore e da raça oito Angus (337 ± 7,4 kg e 16 meses de idade) alocados em duas salas climatizadas por 32 dias. No primeiro período, todos os tourinhos foram alojados em condições de termoneutralidade (TN, ITU = 72,6) por 10 dias. No segundo período (10 dias) quatro tourinhos da raça Angus e quatro da raça Nelore foram submetidos a baixo estresse por calor (BEC, ITU = 76,4) durante o dia e quatro tourinhos Angus e quatro Nelore foram submetidos a alto estresse por calor (AEC, ITU = 81,5) durante o dia. O consumo diurno e diário de matéria seca (MS) dos animais da raça Nelore não foi afetado (P> 0,05) pelo estresse calórico. No entanto, os tourinhos da raça Angus reduziram o CMS diurno em 24% e a CMS diário reduziu (P <0,05) em 15% sob AEC. No TN, os animais da raça Angus apresentaram maior (P <0,05) CMS diário (36,2 g / kg de PC) que os da raça Nelore (29,1 g / kg do PC), mas em AEC eles tiveram (P> 0,05) CMS semelhantes (31,6 e 30,2 g / kg do PC, respectivamente). Observou-se aumento (P <0,05) na frequência respiratória, mas a ingestão de água não foi afetada (P> 0,05) pelo estresse calórico. A Frequência cardíaca diminuiu (P <0,05) com o estresse calórico. Não foi observado efeito do ITU (P> 0,05) sobre o comportamento alimentar. Portanto, recomenda-se o uso de intervalos distintos de ITU para indicar segurança térmica em tourinhos das raças Angus e Nelore. O uso de informações de consumo em conjunto com as variáveis climáticas pode melhorar a predição de desconforto térmico em condições climáticas específicas.UEL2015-12-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionpesquisaapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2102810.5433/1679-0359.2015v36n6Supl2p4565Semina: Ciências Agrárias; Vol. 36 No. 6Supl2 (2015); 4565-4574Semina: Ciências Agrárias; v. 36 n. 6Supl2 (2015); 4565-45741679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/21028/17575http://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessValente, Ériton Egidio LisboaChizzotti, Mario LuizOliveira, Cristiane Viol Ribeiro deGalvão, Matheus CastilhoDomingues, Silas SebastiãoRodrigues, Aline de CastroLadeira, Marcio Machado2022-12-02T15:47:21Zoai:ojs.pkp.sfu.ca:article/21028Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-12-02T15:47:21Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false |
dc.title.none.fl_str_mv |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress Consumo, parâmetros fisiológicos e comportamento de tourinhos Angus e Nelore submetidos a estresse por calor |
title |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress |
spellingShingle |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress Valente, Ériton Egidio Lisboa Beef cattle Intake regulation Temperature. Bovinos de corte Regulação do consumo Temperatura. |
title_short |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress |
title_full |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress |
title_fullStr |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress |
title_full_unstemmed |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress |
title_sort |
Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress |
author |
Valente, Ériton Egidio Lisboa |
author_facet |
Valente, Ériton Egidio Lisboa Chizzotti, Mario Luiz Oliveira, Cristiane Viol Ribeiro de Galvão, Matheus Castilho Domingues, Silas Sebastião Rodrigues, Aline de Castro Ladeira, Marcio Machado |
author_role |
author |
author2 |
Chizzotti, Mario Luiz Oliveira, Cristiane Viol Ribeiro de Galvão, Matheus Castilho Domingues, Silas Sebastião Rodrigues, Aline de Castro Ladeira, Marcio Machado |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Valente, Ériton Egidio Lisboa Chizzotti, Mario Luiz Oliveira, Cristiane Viol Ribeiro de Galvão, Matheus Castilho Domingues, Silas Sebastião Rodrigues, Aline de Castro Ladeira, Marcio Machado |
dc.subject.por.fl_str_mv |
Beef cattle Intake regulation Temperature. Bovinos de corte Regulação do consumo Temperatura. |
topic |
Beef cattle Intake regulation Temperature. Bovinos de corte Regulação do consumo Temperatura. |
description |
Genetics differences between breeds may determine the tolerance to high temperature, effect dry matter intake and consequently cattle performance. The effect of temperature and humidity index (THI) on diurnal, nocturnal and daily intake, water intake, physiologic parameters and behavior of Nellore (B. indicus) and Angus (B. taurus) bulls were evaluated. Eight Angus and eight Nellore young bulls (337±7.4 kg and 16 months of age) were allocated in two climate-controlled rooms for 32 days. In the period 1, all bulls were housed in thermoneutral conditions (TN, THI = 72.6) for 10 days. In period 2 (10 days), four Angus and four Nellore bulls were subjected to low heat stress (LHS, THI = 76.4) in daytime, and four Angus and four Nellore bulls were subjected to high heat stress (HHS, THI = 81.5) in daytime. The diurnal and daily dry matter intake (DMI) of Nellore were not affected (P>0.05) by heat stress. However, Angus bulls decreased diurnal DMI by 24% and daily DMI decreased (P<0.05) by 15% on HHS. In TN Angus bulls had higher (P<0.05) daily DMI (36.2 g/kg of BW) than Nellore (29.1 g/kg of BW), but in HHS they had similar (P>0.05) daily DMI (31.6 and 30.2 g/kg of BW, respectively). We observed an increase (P<0.05) in respiratory frequency, but water intake was not affected (P>0.05) by heat stress. The heart rate decreased (P<0.05) with heat stress. No differences were found (P>0.05) in feeding behavior. Therefore, THI stress threshold should distinct for Angus and Nellore bulls. The use of feed intake information may improve the prediction of thermic discomfort on specific climate condition. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12-16 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion pesquisa |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/21028 10.5433/1679-0359.2015v36n6Supl2p4565 |
url |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/21028 |
identifier_str_mv |
10.5433/1679-0359.2015v36n6Supl2p4565 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/21028/17575 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
UEL |
publisher.none.fl_str_mv |
UEL |
dc.source.none.fl_str_mv |
Semina: Ciências Agrárias; Vol. 36 No. 6Supl2 (2015); 4565-4574 Semina: Ciências Agrárias; v. 36 n. 6Supl2 (2015); 4565-4574 1679-0359 1676-546X reponame:Semina. Ciências Agrárias (Online) instname:Universidade Estadual de Londrina (UEL) instacron:UEL |
instname_str |
Universidade Estadual de Londrina (UEL) |
instacron_str |
UEL |
institution |
UEL |
reponame_str |
Semina. Ciências Agrárias (Online) |
collection |
Semina. Ciências Agrárias (Online) |
repository.name.fl_str_mv |
Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL) |
repository.mail.fl_str_mv |
semina.agrarias@uel.br |
_version_ |
1799306073422692352 |