急速寒冷暴露されたブロイラー雛の体温,心拍数及びふるえに及ぼす飼料摂取の影響

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  • Effects of Feeding on Body Temperature, Heart Rate and Shivering Threshold in Growing Broilers Acutely Exposed to the Cold.

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In order to estimate the possible contribution of heat increment of feeding (HIF) to thermoregulation in terms of enhancement of cold resistance, body surface (Ts) and rectal (Tr) temperatures, heart rate (HR) and shivering threshold were measured as diagnostic indices in fed and fasted growing broilers acutely exposed to the cold. Ts in fed and fasted birds decreased linearly with decreasing ambient temperature (Ta), but standard errors of Ts were, in most cases, greater in fed birds than in fasted birds. Tr in fed birds changed little, but that in fasted birds decreased with decreasing Ta ranging from 23 to 8°C. HR in fasted birds was much lower than that in fed birds at 26°C, changed little until 20°C and then increased steeply. On the other hand, HR in fed birds increased gradually with decreasing Ta. In fed birds, shivering was first observed at 17°C in all 4 birds while, in fasted birds, shivering was seen at 17°C in 2 out of 5 birds and at 14°C in the rest. Overall results indicated that feeding enhanced cold resistance, suggesting that HIF is used as a supplementary heat source for thermoregulation.

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