日粮能量、蛋白质水平对22~42日龄肉鸡WOD168公鸡生长与屠宰性能的影响

为研究22~42日龄肉鸡WOD168公鸡适宜的能量、蛋白质水平,以1 350只22日龄健康的肉鸡WOD168公鸡为试验对象,采用2×3因子设计,研究代谢能水平(ME分别为12.98、13.19 MJ/kg)、粗蛋白水平(CP分别为17.5%、18.5%、19.5%)及其交互作用对鸡生长性能与屠宰性能的影响。结果显示:CP水平为17.5%时42日龄体重显著降低(P<0.01);采食量、料肉比、营养摄入量等均表现出ME、CP的交互作用(P<0.05);屠体率随日粮能量水平提高而降低(P=0.057),而翅膀相对重随蛋白水平提高而提高(P=0.091)。研究提示,22~42日龄肉鸡WOD168公鸡在ME为13.19 MJ/kg、CP为19.5%时可获得最佳生长性能,而ME为12.98 MJ/kg、CP为17.5%时可获得较低料肉比及最佳屠宰性能。

Effects of Dietary Energy and Protein Levels on Growth and Slaughter Performance of WOD168 Male Broiler during 22 to 42 Days of Age

The experiment was carried out to determine an appropriate energy and protein levels for WOD168 male broilers during 22 to 42 days of age. A total of 1 350 22-day-age WOD168 male chicks were used for a 2×3 factorial arrangement to study the effects of metabolizable energy(ME: 12.98, 13.19 MJ/kg), crude protein(CP: 17.5%,18.5%, 19.5%), and the interactive effects. Results indicated that 17.5% CP lowered body weight of male broiler WOD168 at 42 days of age(P<0.01). The interaction effects were observed in feed intake, feed to gain ratio and nutrient intake(P<0.05). Moreover, the carcass ratio was decreased as the increase of ME level in diets(P=0.057), while the wing relative weight were increased when dietary CP level was 19.5%(P=0.091). In conclusion, for WOD168 male chicks aged from 22 to 42 days, 13.19 MJ/kg ME with 19.5% CP could get the best growth performance;while 12.98 MJ/kg ME with 17.5% CP could get lower feed to gain ratio and best slaughter performance.