动物营养学报2017，Vol.29Issue(12)：4355-4364,10.DOI:10.3969/j.issn.1006-267x.2017.12.016
饲粮能量和蛋白质水平对61~120日龄湖羊羔羊生长性能、氮代谢和血清生化指标的影响
Effects of Dietary Energy and Protein Levels on Growth Performance, Nitrogen Metabolism and Serum Biochemical Indices of Hu Lambs at 61 to 120 Days of Age
摘要
Abstract
This experiment was conducted to investigate the effects of dietary energy and protein levels on growth performance, nitrogen metabolism and serum biochemical indices of Hu lambs at 61 to 120 days of age. With a 2 ×2 two factors and two levels experimental design, sixty-four Hu lambs with similar body weight at 61 days of age were randomly allocated into 4 groups, which were high energy [ metabolizable energy ( ME)=10.92 MJ/kg] and high protein [ crude protein ( CP)=15.74% ] group, high energy ( ME=10.92 MJ/kg) and low protein ( CP=11.78% ) group, low energy ( ME=8.64 MJ/kg) and high protein ( CP=15.72% ) group, and low energy ( ME=8.64 MJ/kg) and low protein ( CP=11.82% ) group; each group had 4 repli-cates with 4 lambs per group.The experimental period lasted for 60 days.The results showed as follows:1) no interaction was observed between dietary energy and protein levels on growth performance of lambs ( P>0.05); high dietary energy and protein levels improved average daily gain of lambs at 61 to 90 days of age ( P<0.05) , and significantly decreased feed to gain ratio ( P>0.05) .2) Dietary high protein level significantly increased nitrogen intake of lambs at 81 to 90 days of age and 111 to 120 days of age ( P<0.05); dietary low energy and high protein level significantly increased urinary nitrogen output of lambs at 81 to 90 days of age and 111 to 120 days of age ( P<0.05) , and low energy and high protein group had the highest value;at 81 to 90 days of age, dietary high energy and high protein levels significantly increased nitrogen retention ( P<0.05) , while dietary low energy level or high protein level significantly decreased biological value of nitrogen ( P<0.05) .3) At 120 days of age, dietary low energy level significantly decreased serum glucose content ( P<0.05) , significantly increased serum urinary nitrogen content ( P<0.05); moreover, dietary low protein level significantly increased serum insulin-like growth factorⅠcontent ( P<0.05) .In summary, dietary high energy and protein levels can improve growth performance of lambs at 61 to 90 days of age; however, the feeding cost of lambs can be controlled without affecting growth performance with low protein diet at of 91 to 120 days of age.关键词
羔羊/能量水平/蛋白质水平/生长性能/氮代谢/血清生化指标Key words
lambs/energy level/protein level/growth performance/nitrogen metabolism/serum biochemi-cal parameter分类
农业科技引用本文复制引用
吕小康,祁敏丽,王杰,王世琴,崔凯,刁其玉,张乃锋..饲粮能量和蛋白质水平对61~120日龄湖羊羔羊生长性能、氮代谢和血清生化指标的影响[J].动物营养学报,2017,29(12):4355-4364,10.基金项目
国家公益性行业(农业)科研专项( 201303143) （农业）
国家肉羊产业技术体系建设专项( CARS-39) （ CARS-39）
