温度变化对肉羊生理生化指标影响研究.

In order to study the effects of ambient temperature on feed intake and physiological and biochemical indexes of different sex and age mutton sheep in Yinchuan area. Ten healthy RAMS of the same age, ewe lambs at the same time, weaning lambs at the same time and lactating lambs at the same time were selected from a meat sheep farm in Yinchuan City and were divided into ram group, ewe group, fattening sheep group and lamb group. The nutritional composition of the feed was consistent in all groups except lactating lambs. The experimental period was from September to October 2022, with a total of 28 days, which was divided into 4 stages on average, and the ambient temperature was recorded on day 1, day 8, day 15 and day 22 of the experiment. Feed intake, physiological and blood biochemical indexes of sheep were measured and analyzed by routine measurement and ELISA. The results show that: the feed intake of ewes on day 22 was significantly higher than that on day 1 and day 8 (P<0.01); the temperature at the beginning of the experiment decreased from 31.6 ℃ to 29.11 ℃ at the end of the experiment, and the respiratory rate of ewes on day 22 was significantly lower than that on day 1 and day 15 (P<0.01). The body temperature of ewe on day 15 and day 22 was significantly lower than that on day 1 and day 8 (P<0.01). Compared with day 1, rumination frequency of ewes on day 15 and 22 was significantly decreased (P<0.05); compared with day 1, the respiratory rate of lambs on days 8, 15 and 22 was significantly decreased (P<0.01), and the body temperature of lambs on days 8, 15 and 22 was significantly increased (P<0.01); compared with day 1, the serum total protein content of ewe on day 15 and day 22 was significantly increased (P<0.05), and the serum urea nitrogen content of ewe on day 15 was significantly decreased (P<0.01); compared with day 1, the serum cortisol content of fattening sheep on day 22 was significantly decreased (P<0.05); compared with day 1, the serum cortisol content of RAMS on day 22 was significantly increased (P< 0.01). The results indicated that the continuous decrease of ambient temperature could change the physiological and blood biochemical indexes of meat sheep of different ages and genders, and then affect the breeding efficiency and health level of meat sheep. [ABSTRACT FROM AUTHOR]