Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments
The experiment was carried out with sheep during the finishing phase in a partial confinement system to evaluate the following physiological parameters: rectal temperature (RT), respiratory rate (RR), heart rate (HR), productive performance and carcass characteristics. Fourteen uncastrated sheep wit...
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Sociedade Brasileira de Zootecnia
2014-10-01
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| Series: | Revista Brasileira de Zootecnia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001000556&lng=en&tlng=en |
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| author | Antonio Gesualdi Júnior Érika Sá Viana Sales Rafael Souza Freitas Fábio da Costa Henry Vicente de Paulo Santos de Oliveira Ana Cristina Ladeira de Souza Gesualdi |
| author_facet | Antonio Gesualdi Júnior Érika Sá Viana Sales Rafael Souza Freitas Fábio da Costa Henry Vicente de Paulo Santos de Oliveira Ana Cristina Ladeira de Souza Gesualdi |
| author_sort | Antonio Gesualdi Júnior |
| collection | DOAJ |
| description | The experiment was carried out with sheep during the finishing phase in a partial confinement system to evaluate the following physiological parameters: rectal temperature (RT), respiratory rate (RR), heart rate (HR), productive performance and carcass characteristics. Fourteen uncastrated sheep with an average initial age of 90 days belonging to two genetic groups were used. There were seven Santa Inês animals, whose average initial live weight (ILW) was 23.65 kg, and seven F1 Dorper × St. Inês animals, with an ILW of 20.02 kg. The treatments were the two genetic groups and two times for the collection of the physiological parameters, at 09.00 h and 15.00 h. Evaluation took place once a week, in a shared stall, always following a 20-min grazing activity. The animals had daily access to a Megathyrsus maximus(Jacquin) pasture, cultivar Masai, from 08.00 h to 17.00 h and their feed was placed in a trough, at a forage:concentrate ratio of 51:49 in the total dry matter. The concentrate consisted of 900 g/kg of ground corn and 100 g/kg of soybean meal, and the roughage supplied was alfalfa hay. There was no interaction between treatments for the studied variables. The physiological parameters were affected only by the time of day. The variables RR and RT were higher at 15.00 h, while the highest HR values were observed at 09.00 h. Neither of the two genetic groups differed for performance and carcass characteristics. Hair sheep belonging to close genetic groups show no differences in performance, carcass characteristics and physiological responses when subjected to heat stress. |
| first_indexed | 2024-12-19T03:51:48Z |
| format | Article |
| id | doaj.art-93a5ba7e39ff4b998939dc8b7caeb4ce |
| institution | Directory Open Access Journal |
| issn | 1806-9290 |
| language | English |
| last_indexed | 2024-12-19T03:51:48Z |
| publishDate | 2014-10-01 |
| publisher | Sociedade Brasileira de Zootecnia |
| record_format | Article |
| series | Revista Brasileira de Zootecnia |
| spelling | doaj.art-93a5ba7e39ff4b998939dc8b7caeb4ce2022-12-21T20:36:56ZengSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia1806-92902014-10-01431055656010.1590/S1516-35982014001000008S1516-35982014001000556Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environmentsAntonio Gesualdi JúniorÉrika Sá Viana SalesRafael Souza FreitasFábio da Costa HenryVicente de Paulo Santos de OliveiraAna Cristina Ladeira de Souza GesualdiThe experiment was carried out with sheep during the finishing phase in a partial confinement system to evaluate the following physiological parameters: rectal temperature (RT), respiratory rate (RR), heart rate (HR), productive performance and carcass characteristics. Fourteen uncastrated sheep with an average initial age of 90 days belonging to two genetic groups were used. There were seven Santa Inês animals, whose average initial live weight (ILW) was 23.65 kg, and seven F1 Dorper × St. Inês animals, with an ILW of 20.02 kg. The treatments were the two genetic groups and two times for the collection of the physiological parameters, at 09.00 h and 15.00 h. Evaluation took place once a week, in a shared stall, always following a 20-min grazing activity. The animals had daily access to a Megathyrsus maximus(Jacquin) pasture, cultivar Masai, from 08.00 h to 17.00 h and their feed was placed in a trough, at a forage:concentrate ratio of 51:49 in the total dry matter. The concentrate consisted of 900 g/kg of ground corn and 100 g/kg of soybean meal, and the roughage supplied was alfalfa hay. There was no interaction between treatments for the studied variables. The physiological parameters were affected only by the time of day. The variables RR and RT were higher at 15.00 h, while the highest HR values were observed at 09.00 h. Neither of the two genetic groups differed for performance and carcass characteristics. Hair sheep belonging to close genetic groups show no differences in performance, carcass characteristics and physiological responses when subjected to heat stress.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001000556&lng=en&tlng=enadaptabilityanimal productionbioclimatology |
| spellingShingle | Antonio Gesualdi Júnior Érika Sá Viana Sales Rafael Souza Freitas Fábio da Costa Henry Vicente de Paulo Santos de Oliveira Ana Cristina Ladeira de Souza Gesualdi Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments Revista Brasileira de Zootecnia adaptability animal production bioclimatology |
| title | Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments |
| title_full | Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments |
| title_fullStr | Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments |
| title_full_unstemmed | Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments |
| title_short | Effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments |
| title_sort | effects of heat stress on the physiological parameters and productivity of hair sheep in tropical and coastal environments |
| topic | adaptability animal production bioclimatology |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001000556&lng=en&tlng=en |
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