日粮中添加不同比例木薯茎叶对海南黑山羊生长性能、血清生化指标和养分表观消化率的影响

试验旨在研究将晒干的木薯茎叶以不同比例与精料混合制成的全混合日粮对海南黑山羊生长性能、血清生化指标和养分表观消化率的影响。选择20只海南黑山羊，分成4组（Ⅰ、Ⅱ、Ⅲ、Ⅳ组），每组5只羊（3公2母），Ⅰ、Ⅱ、Ⅲ、Ⅳ组的精料与木薯茎叶比例分别为3：7、4：6、5：5、6：4，试验期60 d。结果显示，Ⅲ组海南黑山羊的平均日增重（ADG）、平均日采食量（ADFI）均高于其他3组，且Ⅲ组ADG显著高于Ⅰ组（P<0.05）；除了Ⅰ组谷丙转氨酶（ALT）显著高于Ⅳ组（P<0.05）外，其他血清生化指标在各组间差异均不显著（P>0.05）；Ⅲ组的饲料养分表观消化率均最高，且均呈Ⅰ组到Ⅲ组逐渐升高，Ⅳ组降低的趋势。综合以上结果，海南黑山羊育肥羊日粮中木薯茎叶与精料的适宜比例为5：5，在此基础上，也可适当降低精料含量，增加木薯茎叶含量，以达到降低饲养成本的目的，但建议木薯茎叶添加比例不宜超过60%。

Effects of Different Proportions of Cassava Stem and Leaf in Diets on Growth Performance,Serum Biochemistry Index and Nutrient Apparent Digestibility of Hainan Black Goat

The test was conducted to study the effect of different proportions of sun-dried cassava stem and leave in diet on growth performance,serum biochemical indexes and nutrient apparent digestibility of Hainan Black goat. 20 weanling Hainan Black goats with similar day old and body weight were selected and divided into four groups (groups Ⅰ,Ⅱ,Ⅲ,Ⅳ) which the concentrate to cassava stem and leaf ratio were 3:7,4:6,5:5 and 6:4,respectively. The test period was 60 d. The results showed that:The ADFI and ADG of group Ⅲ were higher than the other three groups. And the ADG of group Ⅲ was significantly higher than that of group Ⅰ (P<0.05);ALT of group Ⅰ was significantly higher than group Ⅳ (P<0.05),while there was no significant differences in the other indexes (TP,ALB,GLB,AST,BUN,TC,TG and GLU) between the experimental groups (P>0.05).The nutrient apparent digestibility in group Ⅲ were the highest,and all gradually increased from groups Ⅰ to Ⅲ, and then decreased in group Ⅳ. Therefore,in the actual production,the recommend ratio of concentrate to cassava stem and leaf was 5:5 when feed fattening Hainan Black goat. On this basis,it could also be appropriate to reduce concentrated content and increase cassava stem and leave content to reduce the feeding cost,but the proportion of cassava stem and leave should not be more than 60%.