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中文摘要：
于2010--2012年间在内蒙古锡林郭勒盟正镶白旗克氏针茅草原进行了不同载畜率的放牧试验。研究了草地家畜生产性能与牧草干物质体外消化率在不同放牧强度下的变化。结果表明．不同放牧强度下牛日增重呈显著差异（P〈0．05），且均随放牧强度的增加而下降；不同放牧强度下单位公顷牛日增重在MG区显著高于LG区和HG区（P〈0．05）；不同放牧强度下MG区牧草体外消化率显著高于LG区（P〈0．05），且随放牧时间的推移牧草体外消化率逐渐下降。在同时考虑家畜体重与牧草消化率的情况下，放牧强度应控制在o．35～0．40头／hm2。
英文摘要：
The grazing trial with different grazing intensities was carried out in the grassland of Stipa grandis in Zhengxiangbai Banner of Xilingol League, Inner Mongolia from 2010 to 2012. The changes of the production performance of livestock in the grassland and dry matter digestibility in vitro of forages at different grazing intensities were studied. The results showed that the daily gain weight of cattle at different grazing intensities had significant difference （P〈0.05）and decreased with the increase of grazing intensity. Daily gain weight of cattle in unit hectare in MG area was significantly higher than that in LG area and HG area （P〈0.05）. The digestibility in vitro of forages in MG area was significantly higher than that in LG area at different grazing intensities （P〈0.05） and the digestibility in vitro of forages gradually decreased with the grazing time, When both livestock weight and the digestibility of forages were considered, the grazing intensity should be controlled within 0.35~0.40 per hektare.
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