不同能量和粗蛋白水平日粮对石岐杂鸡生产性能、屠宰性能及养分表观代谢率的影响

为研究不同蛋白和能量水平日粮对石岐杂鸡生产性能、屠宰性能及养分表观代谢率的影响,选取21日龄体质量相近、健康的石岐杂鸡120只,随机分为4组(每组3个重复,每个重复10只)进行试验饲喂玉米-豆粕型基础日粮,Ⅰ组、Ⅱ组、Ⅲ组和Ⅳ组能量和蛋白水平分别为12.09MJ/kg和18.07％、13.09MJ/kg和18.01％、...

Effect of Different Levels of Energy and Crude Protein of Diets on the Growth Performance,Slaughter Traits and Apparent Rate of Nutrient Metabolism in Shihchih Broilers

To study the effects of different levels of protein and energy of diets on the growth performance and apparent rate of nutrient metabolism of Shihchih broilers,a total of 120 three-week-old Shihchih broilers were randomly divided into four groups,each group with three repeats.Chicks were fed with corn-soybean meal based diets in which the level of protein and energy were 12.09MJ/kg(18.07%),13.09MJ/kg(18.01%),12.09MJ/kg(20.08%),and 13.09MJ/kg(19.93%) for groupsⅠ,Ⅱ,Ⅲ and Ⅳ,respectively.The experiment lasted for 21 days.The results showed that the group Ⅳ had the highest level of average daily gain(ADG) and the lowest level of Feed/Gain(F/G) while the groupⅠhad the highest level of average daily feed intake(ADFI).Different levels of protein and energy diets did not significantly affect ADG(P>0.05),ADFI(P>0.05) and F/G(P>0.05).The apparent utilization rate of crude protein,crude fat and calcium in group Ⅳ were the highest than the other groups,but the differences were not significant.Moreover the differences were not significant among the other groups(P>0.05).The carcasses weight and leg muscles weight were significantly increased in groupⅡ and Ⅳ(P<0.05).The all net weight loaded,half net loaded weight and slaughter rate were significantly improved in groupⅡ and Ⅳ(P<0.05).According to the effects of diets on slaughtering performance and meat quality of Shihchih broilers,the nutrition level of group Ⅱwas the best.