Nine healthy Chengdu Ma wether Goats with the same father were divided into three groups of three each of similar age and weight (41.3±1.2 kg) randomly and fed with the rice straw (RS) basic diets supplemented with 25%(MSL25),50%(MSL50) and 75%(MSL75) alfalfa hay (Medicago sativa Linn, MSL) respectively for determining the digestion and metabolism of energy in the trial goats .The results were as follows:the GE digestibility of the 3 mixed forages ranked from the greatest to the smallest in the following or-der:MSL75 (58.92%)>MSL50 (54.48%)>MSL25 (51.12%),and the GE metabolism ranked in the same order as that of GE digestibility:MSL75 (48.42%)>MSL50 (44.87%)>MSL25 (41.58%),there was no sig-nificant difference (P>0.05) among MSL50,MSL75 and MSL25 except for MSL25 and MSL75 (PMSL75 ( 82.18%) >MSL25 (81.34%) (P>0.05).It was concluded that the associative effects of RS supplemented with 50%of MSL on energy efficiency of goat were evident .%将9只体况良好，体质量相近（41．3±1．2）kg的成都麻羊半同胞羯羊，随机分成3组，饲以稻草基础日粮，分别补饲25％（MSL25）、50％（MSL50）与75％（MSL75）的苜蓿（MSL），采用单因子试验设计，研究稻草补饲苜蓿对山羊能量消化代谢的影响。结果为：总能（ GE）的消化率与代谢率自高到低的排序均为MSL75、MSL50、MSL25，其相应值消化率分别为58．92％，54．48％，51．12％；代谢率分别为48．42％，44．87％，41．58％，除MSL75与MSL25差异显著（ P＜0．05）外，其余组间差异不显著（ P＞0．05）。 DE 转化为 ME 的效率自高到低的排序为MSL50（82．36％）、MSL75（82．18％）、MSL25（81．34％），组间差异不显著（P＞0．05）。本试验的结论为：山羊稻草基础日粮补饲50％MSL的能量利用效率最佳，表现出明显的组合效应。
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