【摘要】 在草原——家畜生产系统中牧草生产的季节性,与放牧绵羊对营养需求的相对均匀性之间存在尖锐供求矛盾,依据系统耦合理论,在枯草季来临之际将牧地过量家畜转移到作物栽培区短期育肥出栏或存留饲养,系统间的耦合可使草地资源有效利用和家畜稳定生产。在本试验条件下,日粮营养成分对增重影响的重要性,蛋白质为最优因素,依次为代谢能,干物质,粗纤维。更多还原

【Abstract】 <Abstrcat>The grassland productive system was seasonal,which resulted in contradiction with supply and demand,that the herbage production could not meet the need of the nutrition to grazing sheep in a year.According to the theory of system coupling provided by Ran Jizhou,the more livestock were transfered from grazing grassland to farming land to fatten or keep them there before the withered season coming.As a result,the resource was utilized sustainably and the productive efficiency was improved due to the coupling system. In order to elucidate the relationship between the liveweight gain of sheep and the feed nutrition, the nutrition levels were measured. It was showed that the CP was the best, ME the second, DM the third and CF the last.更多还原