蛋氨酸形式和饲粮蛋白质水平对黄羽肉鸡生产性能的影响

选用1日龄快长型岭南黄羽肉鸡公雏1500只,随机分为5个处理,每处理6个重复,每重复50只鸡,分别饲喂以下5种饲粮:正常蛋白质加Alimet饲粮(处理1)、正常蛋白质加DLM饲粮(处理2)、低蛋白质(比正常水平降低约1.5个百分点)加Alimet饲粮(处理3)、低蛋白质加DLM组饲粮(处理4)、正常蛋白质未加蛋氨酸饲粮(处理5)。结果表明,在等摩尔量有效成分添加基础上,Alimet比DLM更有利于提高黄羽肉鸡生长性能,降低饲料成本和死亡率;饲粮蛋白质水平和蛋氨酸形式对43～63日龄和0～63日龄黄羽肉鸡生长性能的影响存在互作效应,表现为在正常蛋白质水平时添加Alimet对黄羽肉鸡生长性能的改善效果优于DLM,且更有利于降低饲料成本,而在低蛋白质水平时添加Alimet和DLM则无显著差异;在本试验条件下,降低饲粮蛋白质水平会对黄羽肉鸡的生长性能、饲料成本和成活率产生不利影响。

Effects of methionine sources and dietary crude protein levels on growth performance of Chinese colorfeather chickens

A total of 1500 male 1-d old Lingnan Chinese color-feathered chickens were allotted to 5 treatments,6 replicates per treatment,50 birds per replicate,which were fed with 5 experimental diets:normal crude protein(CP)+Alimet(Trt1),normal CP+DLM(Trt2),low CP+Alimet(Trt3),low CP+DLM(Trt4)and normal CP without adding methionine(Trt5).The results indicated that compared with DLM,Alimet improved the growth performance,and decreased the feed cost per gain and mortality of Chinese color-feathered chickens.Moreover,there were interactions between Met source and dietary CP level for Chinese color-feathered chicken.At normal CP level,growth performance and feed costs were superior for chickens consuming diets with Alimet,however,all parameters in chickens fed on Alimet and DLM diets were similar at low-CP level.In the condition of this study,low dietary CP level had adverse effects on growth performance,feed cost and liveability of chickens.