不同断奶日龄对舍饲肉用羔羊小肠组织形态发育变化的影响

Effect of Different Early Weaned Day on Histomorphometric Development of Small Intestine for Confined Lambs

为研究不同日龄早期断奶对舍饲羔羊小肠组织形态发育变化的影响。该试验选用陶赛特(♂)×小尾寒羊(♀)杂交F1代公羔(单羔)55只,分为3个处理,测定小肠各段的隐窝深度、绒毛高度、绒毛高/隐窝深(V/C)等组织形态学指标。结果表明,28日龄断奶较42日龄对羔羊小肠组织形态学指标影响大,但其恢复能力较强(断奶后7 d开始恢复);断奶后28日龄断奶组十二指肠绒毛高与隐窝深以较大幅度持续下降,42日龄断奶组各指标也随断奶后天数而下降,但降幅较小;沿小肠近端至远端,断奶对小肠组织形态学指标的影响程度程度趋弱。结果提示,舍饲羔羊不同断奶日龄,会对其小肠组织形态学指标产生一定影响,28日龄断奶羔羊小肠组织形态学指标恢复能力强于42日龄断奶羔羊。

The objective of this study was to investigate the effect of early weaned on histomorphometric development of small intestine for confined lambs.Fifty-five male lambs(small tail han sheep and dorset sheep)were divided into 3 treatments.The crypt depth,villus height and V/C were measured.The results showed that weaning at 28 days had a greater effect on small intestinal histomorphologic indexes than that at 42 days,but its recovery ability was stronger(recovery began at 7 days after weaning).Duodenal villus height and crypt depth of weaning group at 28 days after weaning continued were decreased significantly.The indexes of the 42-day-old weaning group also were decreased with the days after weaning,but the decrease was small.From the proximal end of small intestine to the distal end of small intestine,the effect of weaning on small intestine histomorphologic indexes was weaker.The results indicated that the different weaning age of the lambs in the house feeding had a certain effect on the small intestinal histomorphologic indexes.The recovery ability of small intestinal histomorphologic index of 28-day-old weaned lambs was stronger than the 42-day-old of weaned lambs.