饲粮代谢能和粗蛋白水平对31~86日龄清远麻阉鸡生长性能和经济效益的影响

Effect of Dietary Metabolizable Energy and Crude Protein Levels on Growth Performance and Economic Benefits of Qingyuanma Capons from 31 to 86 Days

试验旨在研究饲粮不同代谢能和粗蛋白水平对31~86日龄清远麻阉鸡生长性能和经济效益的影响,为确定不同生长阶段清远麻阉鸡适宜的代谢能和粗蛋白水平提供数据参考。选用3000只1日龄清远麻阉鸡,采用2×3因子随机分组试验设计,随机分为6组。试验期共86 d。其中,1~30 d饲喂相同饲粮,代谢能和粗蛋白水平分别为12.13 MJ/kg和20.5%;31~60 d饲粮代谢能水平分别为12.68、12.34 MJ/kg,粗蛋白水平分别为18.5%、17.5%和16.5%;61~86 d饲粮代谢能水平分别为12.97、12.76 MJ/kg,粗蛋白水平分别为17.5%、16.5%和15.5%。结果表明:饲粮代谢能水平显著影响31~60日龄清远麻阉鸡平均日采食量(ADFI)、61~86日龄平均日增重(ADG)及31~60日龄和61~86日龄料重比(F/G)(P<0.05),饲粮粗蛋白水平显著影响31~60日龄和61~86日龄F/G及61~86日龄ADG(P<0.05)。其中,12.68 MJ/kg代谢能和18.5%粗蛋白饲粮组31~60日龄F/G最低,12.97 MJ/kg代谢能和17.5%粗蛋白饲粮组61~86日龄F/G最低。从经济效益来看,12.68 MJ/kg代谢能和17.5%粗蛋白组31~60日龄只均利润最高,12.97 MJ/kg代谢能和16.5%粗蛋白组61~86日龄只均利润最高。综合生长性能和经济效益结果,推荐31~60日龄饲粮代谢能和粗蛋白水平为12.68 MJ/kg和17.5%~18.5%,61~86日龄饲粮代谢能和粗蛋白水平为12.97 MJ/kg和16.5%~17.5%。

The purpose of this study was to investigate the effects of different dietary metabolizable en⁃ergy(ME)and crude protein(CP)levels on growth performance and economic benefits of Qingyuanma ca⁃pons from 31 to 86 d,and to provide the basis for determining the appropriate ME and CP levels for Qin⁃gyuanma capons at different growth stages.A 2×3 factorial randomized trial design was used to set two ME levels and three CP levels.A total of 3000 Qingyuanma male chicks of one-day-old were randomly divided into six groups.The trial was for 86 d.During 1 to 30 days of age,ME level was 12.13 MJ/kg,and CP level was 20.5%;during 31 to 60 days of age,ME levels were 12.68 MJ/kg and 12.34 MJ/kg,and CP levels were 18.5%,17.5%and 16.5%,respectively;during 61 to 86 days of age,ME levels were 12.97 MJ/kg and 12.76 MJ/kg,and CP levels were 17.5%,16.5%and 15.5%,respectively.The results showed as follows:①dietary ME levels had significant effects on the average daily feed intake(ADFI)of chickens aged from 31 to 60 days(P<0.05),average daily gain(ADG)of chickens aged from 61 to 86 days(P<0.05),and feed to gain(F/G)of chickens aged from 31 to 60 days and 61 to 86 days(P<0.05).Di⁃etary CP levels had significant effects on F/G of chickens aged from 31 to 60 days and 61 to 86 days(P<0.05),and ADG of chickens aged from 61 to 86 days(P<0.05).Among them,12.68 MJ/kg ME and 18.5%CP diet group had the lowest F/G aged from 31 to 60 days,and 12.97 MJ/kg ME and 17.5%CP diet group had the lowest F/G aged from 61 to 86 days.From the perspective of economic benefits,the highest profit per chicken at 31-60 days of age was found in the 12.68 MJ/kg ME and 17.5%CP group,and the highest profit per chicken at 61-86 days of age was found in the 12.97 MJ/kg ME and 16.5%CP group.According to the results of growth performance and economic benefit,the optimal dietary ME and CP levels are 12.68 MJ/kg and 17.5%to 18.5%for Qingyu⁃anma capons aged from 31 to 60 days,and 12.97 MJ/kg and 16.5%to 17.5%aged from 61 to 86 days.