早期断奶对哈萨克羊体重及体尺的影响

试验通过对两组分别为40日龄和60日龄断奶的哈萨克羊羔羊,进行高、中、低三种不同粗蛋白水平(分别为20%、22%、24%)代乳料的饲喂。研究不同粗蛋白水平日粮对40和60日龄断奶羔羊生长发育的影响。试验分为3组:A组40日龄组,B组60日龄组,C组对照组。结果表明:A、B两组羔羊在三种蛋白水平下平均日增重均极显著高于C组(P<0.01);A组羔羊在20%粗蛋白水平下,平均日增重极显著高于本组其他两个粗蛋白营养水平组以及B、C两组各粗蛋白营养水平组合(P<0.01)。体尺测量结果表明,A、B两组各粗蛋白营养水平组合均极显著高于对照组(P<0.01),A组相对B组各粗蛋白营养水平下体尺增加较明显。3个组的成活率无差别(P>0.05)。分析认为:(1)粗蛋白水平为20%的代乳料能够满足羔羊生长发育需要。(2)羔羊在40和60日龄断奶是完全可行的。经综合评定,哈萨克羔羊40日龄早期断奶效果较好。

Effect of Early Weaning on Body Weight and Size of Kazark Sheep

The experiment was designed to analyze the effect of early weaning with two weaning age(40day and 60 day) and three nutrition levels(20%Cp,22%Cp and 24%Cp) on lamb gain and body size of Kazark Sheep.The sheep were divided into three groups.Group A is 40 day weaning,Group B is 60 day weaning and Group C is the control group fed by milk.The results show:as for average daily gain,under each nutrition level,,both Group A and Group B are extremely significantly higher than that of control group(P<0.01);Among three rations,under 20%Cp ration,Group A is extremely higher than that of other nutrition level GroupB and Group C(P<0.01).As for body size,under each ration,both Group A and Group B are extremely significantly higher than that of control group(P<0.01),and Group A is higher than that of Group B(P<0.05).The conclusion are as follows:firstly,the early weaning ration with Cp20% can meet the requirement of lamb growth.Secondly,it is feasible for Kazark lamb to wean at 40 day and 60 day.Moreover,40 day weaning can get higher benefit rather than that of 60day weaning.