为研究甘肃中部旱区萨寒杂交一代羔羊断奶日龄对采食量、体重、体尺及经济效益的影响,采用单因素完全随机分组试验设计,选择健康的小尾寒羊×萨福克羊初生羔羊100只,随机分为4组,每组25只(公羔15只,母羔10只),分别于45日龄(Ⅰ组)、60日龄(Ⅱ组)、75日龄(Ⅲ组)和90日龄(Ⅳ组)(对照组)断奶,试验期120d.结果表明:①60日龄断奶对羔羊后期采食量影响相对较小,而45日龄断奶对羔羊造成的伤害较大,对其后期发育严重不利.②45日龄前各处理组体重间差异均不显著(P>0.05),120日龄时Ⅱ组羔羊体重(27.25 kg±0.349 kg)显著高于其他各组(P<0.05);30日龄前各处理组间日增重差异均不显著(P >0.05),出生~120日龄日增重Ⅱ组>Ⅰ组>Ⅲ组>Ⅳ组(分别为0.20kg,0.19kg,0.18kg,0.17kg);断奶日龄对羔羊体尺影响不大.③羔羊饲养利润Ⅱ组(330.66元)显著高于其他各组(P<0.05);Ⅱ组母羊繁殖效率经济效益(1256.49元)最高.说明在甘肃中部旱区萨寒杂交一代羔羊选择60日龄断奶更为适合.%This study was conducted to investigate the effect of weaning age on food intake,body weight,body size and economic efficiency of Suffolk×Small-tail han sheep crossbred lambs in the drought zone of middle Gansu.100 Suffolk×Small-tail han sheep crossbred lambs(60 male and 40 female)were selected and randomly assigned into 4 groups with 25 replicates in each group(15 male and 10 female)and 1 lamb per replicate in a single factor experimental design.The lambs were weaning at 45-day(Ⅰ), 60-day(Ⅱ),75-day(Ⅲ)and 90-day(Ⅳ,control group)respectively.The experiment lasted for 120 days.The results showed as follows:①Weaning at 60-day had relatively little effect on food intake in late period,while weaning at 45-day was more harmful to the lambs,and it was very bad for their later development. ②Before 45-day,the body weight of the lambs has no significant difference among the groups(P>0.05).At the age of 120 days the body weight of the lambs in groupⅡ(27.25 kg±0.349 kg)was higher than those in other groups(P<0.05).Before the age of 30 days the daily gain was not different significantly.From birth to 120-day the daily gain wasⅡ>Ⅰ>Ⅲ>Ⅳ(0.20 kg,0.19 kg,0.18 kg and 0.17 kg,respectively).There was no significant difference among groups in body size of the lambs.③The economic profit of lambs and reproduction efficiency of ewes in groupⅡwas the highest(P<0.05).In conclusion,in the present study,Suffolk×Small-tail han sheep crossbred lambs'production performance and economic profit in the group weaning at 60 days was optimum in middle Gansu arid area.
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