开食料补饲日龄对羔羊瘤胃和小肠组织形态的影响

为研究开食料补饲日龄对羔羊瘤胃和小肠组织形态的影响,选用72只体重接近的湖羊初生公羔(双羔,初生重3.51±0.52 kg),随机分为2组,7或42 d补饲开食料,每组36只羔羊。分别在14,28,42,56,70和84 d每组各屠宰6只羔羊,采集瘤胃和小肠组织样品。结果表明:42 d时7 d补饲组瘤胃背囊和腹囊乳头高显著高于42 d补饲组(P<0.05),42 d时7 d补饲组瘤胃腹囊乳头宽有大于42 d补饲组的趋势(P=0.053),42 d时7 d补饲组背囊肌层厚显著高于于42 d补饲组(P<0.05);28和42 d时7 d补饲组十二指肠和回肠绒毛长均显著高于42 d补饲组(P<0.05),42 d时7 d补饲组回肠隐窝深显著低于42 d补饲组(P<0.05),42 d时7 d补饲组十二指肠和回肠绒毛长和隐窝深比显著高于42 d补饲组(P<0.05)。结论 7 d补饲有利于瘤胃组织形态发育和42 d前小肠粘膜发育。

Effect of starter supply age on the morphology of the rumen and small intestine in lamb

The age at which starter is supplied to lambs can affect the development of the intestinal tract.To determine the effect of the age of starter supply on the morphology of the rumen and small intestine of lambs, 72 healthy male Hu lambs (two lambs per litter,birth weight 3.51±0.52 kg)were randomly divided into two groups:one group was supplied with starter at 7 days after birth and the other at 42 days after birth.Six lambs were selected at random for slaughter on day 14,28,42,56,70,and 84,respectively.The results showed that the rumen papillae in the dorsal sac and the ventral sac were significantly longer in the 7-day group than in the 42-day group at 42 days (P <0.05).Also,the rumen papillae in the ventral sac tended to be wider in the 7-day group than in the 42-day group at 42 days (P =0.053).The rumen muscle layer in the dorsal sac was thic-ker in the 7-day group than in the 42-day group at 42 days (P <0.05).The villus length,and the ratio of villus length to crypt depth of the duodenum and ileum were significantly greater in the 7-day group than in the 42-day group at 42 days (P <0.05).The depth of the ileum crypt was smaller in the 7-day group than in the 42-day group at 42 days (P <0.05).Together,these results show that supplying starter from 7 days of age could improve the development of the rumen epithelium before 84 days and the small intestinal mucosa before 42 days.