旨在探讨不同微生物脂肪酶对黄羽肉鸡生长性能、血清生化指标和胸肌营养成分的影响.试验选取1日龄黄羽肉公鸡400只，随机分成4个处理组，每个处理4个重复，每重复25只鸡.分为对照组、脂肪酶A组、脂肪酶B组和组合酶组，加酶组按日粮中猪油添加脂肪酶35 000 U/kg.添加脂肪酶能够促进黄羽肉公鸡发育，显著增加平均日采食量和平均日增质量，降低后期和全期料质量比（P<0.05）.添加脂肪酶可以降低后期黄羽肉公鸡血清中总胆固醇和高、低密度脂蛋白的含量（P<0.05），并提高高、低密度脂蛋白比值.添加不同脂肪酶不同程度地影响了黄羽肉公鸡胸肌干物质中蛋白质和脂肪的含量.结果提示，添加脂肪酶能够改善黄羽肉鸡生长性能和脂质代谢，并且影响胸肌营养成分的沉积，这可能与脂肪酶水解特异性有关.
The study investigated the effects of different microbial lipases on growth performance, serum biochemical indices, and pectoral muscle nutrients of yellow-feathered broilers. A total of 400 1-d-old male yellow-feathered broilers were randomly divided into 4 treatments with 4 replicates for each treatment and 25 chickens in each replicate. Treatments were consisted of control group, lipase group A, lipase group B, and combinatorial enzyme group. The lipases were added as 35 000 U for 1 kg lard. Lipase addition promoted development of male yellow-feathered broilers, increased average daily feed intake and average daily gain, and decreased feed to gain ratio in the whole and the late period of experiment (P<0.05).Lipase supplement reduced the total cholesterol, high density lipoprotein (HDL), and low density lipoprotein (LDL) content in the male yellow-feathered broilers’ serum at the late-period experiment (P<0.05), increasing HDL,LDL ratio. Different lipases had different influences on protein and fat content of breast muscle dry matter of male yellow-feathered broilers. The results indicated that lipase addition could improve male yellow-feathered broilers’ growth performance, lipid metabolism, and impact their pectoral muscle nutrition deposition, which may be relative to lipase hydrolysis specificity.