生长期能量采食水平对生长蛋鸡的影响

Effect of Varying Dietary Energy Levels on Pullet Growth

试验用 43 2只伊莎褐商品蛋鸡 ,研究了三个不同能量采食水平日粮对生长、性成熟的影响。试验得出在 7～ 9,10～ 12 ,13～ 15 ,16～ 18周内 ,高能量采食水平组鸡比中、低能量采食水平组鸡的日增重高 2 .5 2 %、5 .43 %(P <0 0 5 ) ,3 .3 3 %、16.5 9%(P <0 .0 1) ,8.1%、12 .9%(P <0 .0 1) ,2 3 .6%、45 .1%(P <0 .0 1) ,各期日增重差异显著 ;饲料转化效率在 7～ 9周高能采食水平组比中、低能量采食水平组高 4.5 %、6.0 %(P <0 .0 5 ) ,在 10～ 12周高能组比中、低能组高5 79%、10 .93 %(P <0 .0 1) ,在 16～ 18周高、低能组比中能组鸡高 2 3 .4%、3 9.2 %(P <0 .0 1)。全期体重随能量采食水平增加而增加。高、中能量采食水平组鸡达 5 %产蛋率日龄比低能组分别提前 14和 12 .4d(P <0 .0 5 ) ,高、中能组鸡达5 0 %产蛋率的时间比低能组早 6.2d、5 .8d(P <0 .0 1)。表明生长期能量采食水平高的鸡 ,日增重多 ,体重增加的快、;体重大的鸡 ,开产早 。

Effects of dietary energy levels and main ingredients,corn and soybean meal in rearing diets on pullet development and subsequent layer performance were studied using 432 brown Yisha pullets of a connercial strain. During the growing period of 7～12 weeks ,each meal was assigned to three energy levels of 12.89,11.72 or 10.54 MJ/kgME diet containing CP 15%,then changed to 13.10,11.92 or 10.75 MJ/kgME with CP 14% from 13～18 weeks.At the end of 18 wk, half of the pullet within each rearing treatments were fed a layer diet containing 11.09 MJ/kgME,whereas the other half were fed a layer diet containing 11.30 MJ/kgME.High ditary energy intake increased significantly body weight,feed conversion efficiency,during weeks 7 through 12, weeks 13 through 18, respetively.Treatment of high energy intake levels made the pullet matured early.