动物营养学报Issue(8)：2534-2543,10.DOI:10.3969/j.issn.1006-267x.2015.08.027
22~42日龄肉仔鸡饲粮粗蛋白质最低需要量的研究
Dietary Crude Protein Requirement of Broilers from 22 to 42 Days of Age
摘要
Abstract
An experiment was conducted to investigate the effect of dietary crude protein ( CP) level on growth performance, carcass quality, serum biochemical parameters, immune indexes, nitrogen emission and nitrogen apparent availability in broilers, so as to estimate the minimum CP requirement of broilers fed corn-soybean di-et from 22 to 42 days of age. A total of 360 22-day-old male broilers were randomly assigned to 5 groups with 10 replicates per group and 6 birds each replicate.The birds were fed the diet containing CP 19.87% (control), 18.84%, 17.63%, 16.81%, 15.75% or 14.88% for 21 days. The nitrogen metabolism test was conducted from 38 to 42 days of age. The results showed as follows:broilers fed lower CP level diets had significantly higher values of ratio of feed to gain, percentage of abdominal fat, drip loss and a∗values of breast meat, a∗and b∗ values of thigh meat, serum contents of total cholesterol, triglyceride and uric acid, as well as nitrogen apparent availability ( P<0.05) . Average daily gain, L∗of breast meat, serum ND antibody titer and fecal ni-trogen were significantly increased as the dietary CP level decreased, respectively (P<0.05). Compared with the control, no significant differences were observed in the above mentioned indexes for broilers fed diets con-taining 17.63% of CP (P>0.05), however, nitrogen content in feces was significantly lower (P<0.05). Broilers fed diets containing 16.81% or lower CP had significantly lower average daily gain and ND antibody titer ( P<0.05) . Ratio of feed intake to body gain, abdominal fat, drip loss of breast meat, serum total choles-terol and triglyceride were significantly higher when chicks were fed diets with lower CP than 16.81%, respec-tively ( P<0.05) . Therefore, the minimum dietary CP requirement of broilers from 22 to 42 days of age is sug-gested as 17.63%.关键词
粗蛋白质/需要量/肉仔鸡Key words
crude protein/requirement/broilers分类
农业科技引用本文复制引用
曾晓阁,李晓菲,胡义信,温倩,赵露露,张丽阳,李素芬,罗绪刚..22~42日龄肉仔鸡饲粮粗蛋白质最低需要量的研究[J].动物营养学报,2015,(8):2534-2543,10.基金项目
国家现代农业产业技术体系岗位专家专项经费( CARS-42) （ CARS-42）
中国农业科学院科技创新工程专项经费( ASTIP-IAS08) （ ASTIP-IAS08）
