不同营养水平对海兰白蛋鸡育成期增重及效益的影响

Effect of different nutrition level on the weight gail at growing period and the profit in hy－line white hens

选同日龄海兰白雏鸡620只，随机分为3个组，每组4个重复。1、2、3处理组日粮营养水平依次为育雏期（0～8周龄）粗蛋白18％、20％、21％，代谢能11．93、11．93、12．56MJ／kg；育成期（9～20周龄）粗蛋白17％、18％、19％，代谢能11．72、11．93、12．14MJ／kg。试验结果表明：育雏期试验鸡增重和结束体重均随日粮营养水平的提高而增加，以处理3组增重效果最好，分别比1、2处理组提高增重3．82％和3．19％；能量水平相同、蛋白质水平不同的1、2处理组间增重及8周龄体重基本一致。育成期20周龄和结束体重不同营养水平间比较接近。全期单鸡耗料3个处理组间以处理3组最低，单位增重蛋白质消耗量随营养水平的提高而增加，能量的消耗则比较接近。综合分析育雏期以处理3组、育成期以处理2组饲养效果较好。

620 hy－line white laying hens were randomly divided into 3 groups and there were 4 replicates each．Dietary crude protein （CP） and metabolizable energy （ME） of group 123 were 18％11．93MJ／kg20％11．93 MJ／kg21％12．56 MJ／kg respectively during starting period（0～8wk） and were 17％11．72 MJ／kg18％11．93 MJ／kg19％12．14 MJ／kg respectively during growing period （9～20wk）．The results indicated thatThe weight gain and body weight at the end of starting period increased with the increasing nutrition level．The weight gain of group 3 was the biggest and was higher 3．82％ than group 1higher 3．19％ than group 2 at the end of starting period．The weight gain and body weight of group 1 at 8 wk of age had no significant deference from that of group 2．Body weight at 20 wk of age had no significance deference among groups．During testfeed intake of group 3 was the lowestCP consumption per unit weight gain increased with the increasing the nutrition contentbut ME consumption had no significant change．We can concluded that the nutrition level of group 3 was best during the staring period and that of group 2 was best during growing period．