中文摘要：

将9只体况良好，体重相近（41．3±1．2kg）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％（MSLS0）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〉MSLS0〉MSL25，其相应值分别为58．92％、54．48％与51．12％，48．42％、44．87％与41．85％，除MSL75与MSL25外（P〈0．05），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MSI．50（82．36％）〉MSL75（82．18％）〉MsL25（81．85％），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。

英文摘要：

Nine healthy Chengdu Ma wether Goats with the same father were divided into three groups of three each of comparable age and weight （41.3 ± 1.2 kg） randomly and fed the goat with the rice straw （RS） basic diets supplemented with 25% （ MSL25）, 50% （MSL50） and 75% （MSL75） alfalfa hay （Medieago sativa Linn, MSL） respectively for determining the digestion and metabolism of energy in trial goats. The results were as follows ： a. the GE digestibility for the 3 mixed forages ranked from greatest to least in the fol- lowing： 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 （41.85 % ）, there was no significant difference （ P 〉 0.05） be- tween MSL50 and MSL75, MSL25 except for MSL25 and MSL75 （P 〈 0. 05） for both CE digestibility and its metabolism, b. the con- version efficiency of DE to ME for the 3 mixed forages ranked from greatest to least in the following： MSL50 （82.36%） 〉 MSL75 （ 82.18 % ） 〉 MSL25 （ 81.86% ） （ P 〉 0.05）. It was concluded that the associative effects on energy efficiency of goat fed RS supple- mented with the 50% of MSL were apparent.