Abstract: The experiment of grazing intensity was conducted in Stipa breviflora desert steppe at haya teaching ranch of Inner Mongolia Institute of Agriculture and Animal Husbandry with crossbred wether from 1985 to 1989.The prodution performance of sheep was analysed in order to investigate the relationship between grazing intensity and sheep production and to determine the optimum stocking rate of the pasture.The results showed that live weight of sheep in LG was higher (P<0.01) than in MG and HG; The gross live　weight gain of sheep in LG was higher(P<0.01) than in HG during the experimental period ; There was no significant difference (P>0.05) on liveweight loss among grazing intensitiesI There was higher (P<0.01)clean -fleece weight in LG than in MG and HG and no significant difference (P>0.05) between MG and HG; According to the analysis of economic benefit, MG is the best economic and rational grazing intensity.

Key words: Stipa breviflora steppe, Grazing intensity, Crossbred wether, Animal performance, Economic benefit

摘要： 1985～1989年在内蒙古农牧学院哈雅教学牧场选用杂种羯羊在短花针茅草原上进行放牧强度试验,分析各处理对绵羊生产性能的影响,旨在探讨放牧强度与绵羊生产之间的关系,确定适宜的载畜率。研究结果表明,轻度放牧的绵羊体重显著高于中度和重度放牧(P<0.01);放牧期间轻度放牧绵羊的总增重量显著高于重度放牧(P<0.01),各处理间绵羊掉源量无明显差异(P>0.05);轻度放牧绵羊净毛量显著高于中度和重度放牧(P<0.01),而两者之间净毛量无显著差异(P>0.05);经济效益分析表明,载畜率为1.07ha/只·年的中度放牧是最为经济合理的放牧强度。

关键词: 短花针茅草原, 放牧强度, 杂种羯羊, 生产性能, 经济效益