青藏高原天然草场放牧家畜体重和体能量变化动态

Dynamic changes of body weight and energy of livestock grazing on natural grassland in Qinghai-Tibetan Plateau

用逐月称重法和季节屠宰试验获得青藏高原放牧家畜的体重和体能量沉积的季节动态。结果表明 ,放牧家畜在出生后第 1个冷季的体重下降幅度远低于第 2个冷季 ,高山细毛羊在暖季每千克增重的能量水平保持稳定 ,尽管秋季略有下降 ,但与夏季相比 ,差异不显著 ;牦牛在秋季每千克增重的能量则远高于夏季。牦牛和高山细毛羊在冬季每千克减重的能量水平远高于春季。牦牛和高山细毛羊在第 2个暖季所积累的能量约有一半以上在第

Seasonal dynamic of live body weight and returned energy accumulation of livestock grazing on natural grassland in Qinghai-Tibetan Plateau was obtained by using monthly weighting and comparative slaughtering experiment. The results suggested that the scale of body weight decrease of grazing livestock in the first cold season was much lower than that in the second cold season, and the energy retention of per kilogram weight gain of the sheep during warm season kept stable, althought it had a slight decrease in autumn compared with summer seasen. Energy retention of per kilogram weight gain of yak was much higher in autumn than in summer. Energy content of per kilogram weight loss of yak and sheep was much higher in winter than in spring. More than half of the total energy retention of yak and sheep during the second warm season was consumed during the second cold season.