本文旨在研究日粮中添加不同水平α-半乳糖苷酶对黄羽肉鸡生长性能和养分利用率的影响。选择500羽8日龄快速生长型黄羽肉鸡，随机分为5个组，每组4个重复，每个重复25羽。试验分为前期(8～28日龄)和后期(29～56日龄)2个阶段。试验Ⅰ组饲喂正对照日粮(ME：前期11.92 MJ/kg，后期12.34 MJ/kg)，试验Ⅱ组饲喂负对照日粮(ME：前期11.71 MJ/kg，后期12.13 MJ/kg)，试验Ⅲ～Ⅴ组分别饲喂在负对照日粮中添加100、150和200 mL/t α-半乳糖苷酶的试验日粮。结果表明：各组间肉鸡的平均日增重、日采食量、前期和全期料重比以及全期存活率均无显著差异(P>0.05)，但添加α-半乳糖苷酶制剂的各试验组后期料重比均低于正对照组(P>0.05)和负对照组(P<0.05),全期料重比也都低于正、负对照组(P>0.05)；3个加酶组的干物质、粗蛋白质、能量表观代谢率和表观代谢能与正、负对照组相比无显著差异(P>0.05)；3个加酶组的缬氨酸、亮氨酸和赖氨酸表观消化率显著高于负对照组(P<0.05)，但总氨基酸表观消化率各组间差异不显著(P>0.05)。由此可知，在代谢能降低0.21 MJ/kg的玉米-豆粕-杂粕型日粮中添加α-半乳糖苷酶制剂可降低黄羽肉鸡后期料重比，提高部分氨基酸表观利用率。

This experiment was conducted to study the effects of different levels of α-galactosidase on growth performance and nutrient availability in yellow broilers. Five hundred 8-day-old yellow broilers were randomly assigned to five groups with four replicates and twenty-five chicks in each replicate. Experiment was divided into 2 periods (8～28 d and 29～56 d) and lasted 49 days. Group Ⅰ fed positive control diets (PC, ME: 8～28 d 11.92 MJ/kg, 29～56 d 12.34 MJ/kg); group Ⅱ fed negative control diets (NC, ME: 8～28 d 11.71 MJ/kg, 29～56 d 12.13 MJ/kg). Group Ⅲ～Ⅴ were fed NC diets supplemented with 100, 150 and 200 mL/t of α-galactosidase, respectively. The results showed that the average daily weight gain (ADG), average daily feed intake (ADFI), 8～28 d and 8～56 d feed to gain ratio (F/G) and survival rate had no significantly difference among five groups (P>0.05), but 29～56 d F/G in group Ⅲ～Ⅴ was lower than that in PC group (P>0.05) and NC group (P<0.05),and 8～56 d F/G in group Ⅲ～Ⅴ was also lower than that in NC group and PC group (P>0.05). The apparent metabolizability of DM, CP, energy and the apparent metabolizable energy in group Ⅲ～Ⅴ had no significant difference (P>0.05) compared with those of NC and PC group. The apparent digestibility of Val, Leu and Lys in group Ⅲ～Ⅴ were significantly higher than that in NC group (P<0.05), but the apparent digestibility of total AA had no significant difference among 5 groups (P>0.05). It was concluded that the supplementation of α-galactosidase in NC diets could reduce F/G of 29～56 d yellow broilers and improve the apparent availability of some AA.［Chinese Journal of Animal Nutrition, 2009，21(6):924-930］