Efeito do Nível de Energia da Dieta e da Exposição Prévia ao Calor sobre a Respiração Mitocondrial do Músculo Cardíaco de Frangos de Corte
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Data
1999-01-01
Autores
Macari, Marcos [UNESP]
Furlan, Renato Luís [UNESP]
Guerreiro, José Roberto [UNESP]
Secato, Euclides Roberto [UNESP]
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Resumo
This work was conducted aiming to evaluate the effect of dietary energy level and the previous heat exposure on the respiratory activity of the mitochondria from the cardiac muscle of broiler chickens. It was used broiler chickens (Hubbard) from both sexes and fed with diet containing 2900 kcal ME/kg or 3200 kcal ME/kg. The birds were heat stressed (35°C/4h) in the 1 st, 21 st and 42 nd days of age. The respiratory activity of mitochondria from cardiac muscle was evaluated in a Gilson oxygraph, model 5/6, by using alpha-ceto-glutaric as substrate and the ADP (adenosine-di-phosphate) to stimulate the respiratory activity. There was not effect of dietary energy level and previous heat exposure on the respiratory activity of the mitochondria from cardiac muscle. However, the females presented higher respiratory activity than males. By reason of the low oxidative capability of the heart muscle fiber of the male broiler chickens, these could be more sensitive to cardiac disease than females.
Descrição
Palavras-chave
Broiler chickens, Cardiac muscle, Dietary energy, Mitochondria respiratory activity, Aves, Gallus gallus
Como citar
Revista Brasileira de Zootecnia, v. 28, n. 1, p. 118-121, 1999.