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Heat tolerance index, food intake and weight gain of Santa Ines sheep in the agreste region of Pernambuco State, Brazil/Indice de tolerancia ao calor, consumo alimentar e ganho de peso de ovinos da raca Santa Ines na regiao agreste do Estado de Pernambuco, Brasil
This study evaluated the influence of coat color on the heat tolerance and performance of 21 Santa Ines lambs, non-pregnant, non-lactating, seven animals of each coat color: black, brown and white, with an average initial weight of 25.71, 24.85 and 25.00 kg, for white, brown and black animals, respe...
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Published in: | Acta scientiarum. Animal sciences 2013-07, Vol.35 (3), p.307 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | Spanish |
Subjects: | |
Online Access: | Get full text |
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Summary: | This study evaluated the influence of coat color on the heat tolerance and performance of 21 Santa Ines lambs, non-pregnant, non-lactating, seven animals of each coat color: black, brown and white, with an average initial weight of 25.71, 24.85 and 25.00 kg, for white, brown and black animals, respectively, and 12 months of age. The study was conducted during summer in the agreste region of Pernambuco State, Brazil. Twenty-one sheeps were assigned to a completely randomized design with three treatments and seven replicates. The heat tolerance index and the animal performance were evaluated once a week for eight weeks. White sheep were slightly superior in heat tolerance to brown and black sheep, 88.3, 85.5 and 86.6 respectively, but this was not reflected in the growth performance of the animals, which showed average daily weight gain of 170.10, 193.69 and 199.50 g for animals white, brown and black, respectively. Keywords: adaptation, bioclimatology, climate, heat stress. Os objetivos deste trabalho foram verificar a influencia da cor do pelame na tolerAncia ao calor e ganho de peso de 21 cordeiras da raca Santa Ines, nao-gestantes e nao-lactantes, sendo sete de cada uma das pelagens preta, castanha e branca, com peso medio inicial de 25,71; 24,85 e 25,00 kg, respectivamente, para os animais brancos, castanhos e pretos e aproximadamente 12 meses de idade. Os experimentos foram conduzidos durante o verao na regiao agreste do Estado de Pernambuco, Brasil. O indice de tolerAncia ao calor e o desempenho dos animais foram avaliados uma vez por semana durante oito semanas. O delineamento experimental foi inteiramente casualizado com tres tratamentos e sete repeticoes. Ovinos brancos apresentaram pequena superioridade na tolerAncia ao calor que os castanhos e pretos, 88,3; 85,5 e 86,6 respectivamente, mas isso nao se refletiu no desempenho produtivo dos animais, os quais apresentaram ganho de peso medio diario de 170,10; 193,69 e 199,50 g para os animais brancos, castanhos e pretos, respectivamente. Palavras-chave: adaptacao, bioclimatologia, clima, estresse termico. |
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ISSN: | 1806-2636 |
DOI: | 10.4025/actascianimsci.v35i3.18466 |