Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress
<p>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...
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| Format: | Article |
| Language: | English |
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Universidade Estadual de Londrina
2015-12-01
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| Series: | Semina: Ciências Agrárias |
| Subjects: | |
| Online Access: | http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/21028 |
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| author | Ériton Egidio Lisboa Valente Mario Luiz Chizzotti Cristiane Viol Ribeiro de Oliveira Matheus Castilho Galvão Silas Sebastião Domingues Aline de Castro Rodrigues Marcio Machado Ladeira |
| author_facet | Ériton Egidio Lisboa Valente Mario Luiz Chizzotti Cristiane Viol Ribeiro de Oliveira Matheus Castilho Galvão Silas Sebastião Domingues Aline de Castro Rodrigues Marcio Machado Ladeira |
| author_sort | Ériton Egidio Lisboa Valente |
| collection | DOAJ |
| description | <p>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 (<em>B. indicus</em>) and Angus (<em>B. taurus</em>) 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. </p> |
| first_indexed | 2024-12-23T11:46:44Z |
| format | Article |
| id | doaj.art-e8aa5ddbcf854d3cb50ae34cd0785370 |
| institution | Directory Open Access Journal |
| issn | 1676-546X 1679-0359 |
| language | English |
| last_indexed | 2024-12-23T11:46:44Z |
| publishDate | 2015-12-01 |
| publisher | Universidade Estadual de Londrina |
| record_format | Article |
| series | Semina: Ciências Agrárias |
| spelling | doaj.art-e8aa5ddbcf854d3cb50ae34cd07853702022-12-21T17:48:20ZengUniversidade Estadual de LondrinaSemina: Ciências Agrárias1676-546X1679-03592015-12-01366Supl24565457410.5433/1679-0359.2015v36n6Sup2p456512774Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stressÉriton Egidio Lisboa Valente0Mario Luiz Chizzotti1Cristiane Viol Ribeiro de Oliveira2Matheus Castilho Galvão3Silas Sebastião Domingues4Aline de Castro Rodrigues5Marcio Machado Ladeira6Universidade Estadual do Oeste do ParanáUniversidade Federal de ViçosaUniversidade Federal de LavrasUniversidade Federal de LavrasUniversidade Federal de LavrasUniversidade Federal de LavrasUniversidade Federal de Lavras<p>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 (<em>B. indicus</em>) and Angus (<em>B. taurus</em>) 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. </p>http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/21028Beef cattleIntake regulationTemperature. |
| spellingShingle | Ériton Egidio Lisboa Valente Mario Luiz Chizzotti Cristiane Viol Ribeiro de Oliveira Matheus Castilho Galvão Silas Sebastião Domingues Aline de Castro Rodrigues Marcio Machado Ladeira Intake, physiological parameters and behavior of Angus and Nellore bulls subjected to heat stress Semina: Ciências Agrárias Beef cattle Intake regulation Temperature. |
| title | 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_short | 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 |
| topic | Beef cattle Intake regulation Temperature. |
| url | http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/21028 |
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