摘要
采用呼吸测热与体温、呼吸频率及心率测定相结合的方法,在海拔高度3250m处对1—3岁12头绝食牦牛等热区进行研究。结果表明,生长牦牛等热区为8—14℃;高于14℃时试牛的心率、呼吸频率及体温剧增,绝食产热增加,每升高1℃,日产热增加10.5kJ/kgW^(0.52);低于8℃时,心率及呼吸频率无明显变化,但体温降低,绝食产热减少,每下降1℃,日产热减少14.6kJ/kgW^(0.52);低于-20℃时,每下降1℃,日产热增加18.4kJ/kgW^(0.52)。
This experiment was conducted at the altitude of 3250 metres above sea level to determine the zone of thermoneutrality(ZTN) of the fasted growing yak. Twelve yaks at the age of 1-3 years were used to measure the respiratory rate(RR), heart rate(HR) and the rectal temperature(RT) as well as fasting heat production(FHP) with closed-circuit mask. The results show that the ZTN of the growing yak is 8-14℃. When ambient temperature(Ta) is higher than 14℃, the RR,HR and RT rise up immediately,and whenever Ta rise 1℃ the daily FHP increases by 10.5kJ/kgW^(0.52). When Ta is below 8℃,the RT drops down,and whenever Ta descend 1℃ the daily FHP decreases by 14.6kJ/kgW^(0.52), and there is no change in HR and RR. When Ta is lower than-20℃,the daily FHP increases rapidly by 18.4kJ/kgW^(0.52)℃.
出处
《青海畜牧兽医杂志》
1992年第2期18-20,共3页
Chinese Qinghai Journal of Animal and Veterinary Sciences
关键词
变化规律
牛
牦牛
等热区
绝食产热
Yak
Zone of thermoneutrality
Fasting heat production
Rectal temperature
Respiratory rate
Heart rate
Air temperature
