隔栏补饲时间对杜湖杂交羔羊生长性能、羊毛品质和血清生化指标的影响

Effects of Supplementary Feeding Time by Fence on Growth Performance,Wool Qualityand Serum Biochemical Indices of Dorper×Hu Sheep Hybrid Lambs

试验通过研究不同隔栏补饲时间对杜湖杂交羔羊生长性能、羊毛品质和生化指标的影响,以确定最佳的羔羊隔栏补饲时间。选取体重均匀、体况相近的健康公羔180只,分为3组,每组60只,15日龄时开始隔栏补饲,40日龄时结束,Ⅰ组每日隔栏补饲时间为6 h,Ⅱ组从6 h过渡至10 h,Ⅲ组从6 h过渡至12 h。试验开始和结束当天晨饲前对羔羊称重测定其生长性能指标,试验结束当天采集毛样和血样测定羔羊羊毛品质及血清生化等相关指标。结果表明,随着隔栏补饲时间的延长,羔羊表现出平均日增重逐渐增大、采食量下降、料重比减小的趋势,但组间差异不显著(P>0.05)。羔羊体侧部羊毛中有髓毛与无髓毛的比例在不同组间差异显著(P<0.05),有髓毛占比Ⅰ组>Ⅱ组>Ⅲ组,无髓毛占比Ⅲ组>Ⅱ组>Ⅰ组,无髓毛比例随隔栏补饲时间的延长而增加,其他羊毛指标组间差异不显著(P>0.05)。Ⅱ和Ⅲ组羔羊血清甘油三酯含量显著高于Ⅰ组(P<0.05),Ⅰ和Ⅱ组羔羊血清白蛋白含量显著高于Ⅲ组(P<0.05),Ⅱ组肌酐含量显著高于Ⅲ组(P<0.05),Ⅱ组肌酸激酶活性显著高于Ⅰ和Ⅲ组(P<0.05)。综合分析,羔羊15~40日龄与母羊逐渐隔离,随着羔羊隔栏补饲时间的延长,其生长性能得到了提高。隔栏补饲时间最长的Ⅲ组,其平均日增重、料重比及羊毛品质均优于其他组。

In order to determine the best supplementary feeding time by fence for lambs,the growth performance,wool quality and serum biochemical indexs of Dorper×Hu sheep hybrid lambs with different supplementary feeding time were tested.180 healthy male lambs with uniform body weight and similar body conditions were selected and divided into 3 groups with 60 lambs in each group.Each group started supplementary feeding by fence at 15-day-old and ended at 40-day-old.The time of supplementary feeding by fence was 6 h per day for lambs in groupⅠand the time of groupⅡwas transitioned from 6 to 10 h and from 6 to 12 h in groupⅢ.Lambs were weighed at the beginning and ending of the experiment to determine their growth performance,at the end of the experiment,wool and blood samples were collected to determine wool quality and serum biochemical indexes.The results showed that with the prolongation of supplementary feeding time by fence,the average daily gain of lambs increased gradually,the feed intake decreased,and the ratio of feed to gain decreased,but there was no significant difference between groups(P>0.05).There were significant differences in the proportion of medullated and non medullated wool in lamb lateral wool among different groups(P<0.05).For proportion of medullated hairs,groupⅠ>groupⅡ>groupⅢ,while for percentage of unmyelinated hairs,groupⅢ>groupⅡ>groupⅠ,and the proportion of unmyelinated hair increased with the prolongation of supplementary feeding time by fence.There was no significant difference in other wool indexes among groups(P>0.05).The content of serum triglyceride in groupsⅡandⅢwas significantly higher than that in groupⅠ(P<0.05),the content of serum albumin in groupsⅠandⅡwas significantly higher than that in groupⅢ(P<0.05),the content of creatinine in groupⅡwas significantly higher than that in groupⅢ(P<0.05),and the content of creatine kinase in groupⅡwas significantly higher than that in groupsⅠandⅢ(P<0.05).In conclusion,when lambs were gradually isolated from their mothers from 15 to 40 days of age,The growth performance of lambs was improved with the extension of feeding time.The results showed that groupⅢ,which had the longest feeding time,had the best performance in average daily gain,feed to weight ratio and wool quality.