環境温度の変化にともなうメン羊の一般生理諸元と尿中カテコ-ルアミン排泄量の変動

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Two experiments were conducted to determine the influence of the different changing pattern of environmental temperature on some physiological responses and the amount of urinary catecholamine (noradrenaline, NA; adrenaline, A) excretion in sheep. In experiment 1, the animals were exposed for 5.5 days to the temperatures of 25°C and 5°C (70% relative humidity) for 12 hours each in a day. The animals in experiment 2 were exposed to the temperature of 25°C, 5°C and 25°C for 7 days each. Concerning the above mentioned criteria, comparison was made between these two experiments. The results obtained were as follows: 1) Exposure of sheep to 25°C caused significantly higher (P<0.01) rectal temperature in experiment 1 (39.3±0.1°C) than in experiment 2 (38.8±0.1°C), while the value was higher (P<0.01) in experiment 2 (38.6±0.1°C) than in experiment 1 (38.0±0.2°C) when sheep were exposed to 5°C. 2) In experiment 1, higher (P<0.01) heart rate was observed at 25°C compared to 5°C, which was not in agreement with the usual observations. 3) Although no significant increase in NA level was detected in experiment 1, the pronounced(P<0.01) variation of A from 0.71±0.08μg/day(20°C)to 1.42±0.46μg/day (at diurnal temperature change) was observed. In experiment 2, both NA and A concentrations increased (P<0.01) from 9.70±1.53 and 0.97±0.05μg/day (25°C) to 17.88±4.54 and 2.74±1.13μg/day(5°C), respectively. As a result of these observations, it was suggested that the cause for the increased amount of catecholamine secretion in sheep urine was due to the low temperature of 5°C per se rather than temperature change from 25°C to 5°C at intervals of 12 hrs.
社団法人日本畜産学会の論文

環境温度の変化にともなうメン羊の一般生理諸元と尿中カテコ-ルアミン排泄量の変動

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