断奶日龄对舍饲羔羊小肠内容物中主要消化酶活性的影响

发布时间：2018-04-02 20:36

本文选题：羔羊　切入点：断奶日龄　出处：《中国畜牧兽医》2017年09期

【摘要】：为研究早期断奶日龄对羔羊小肠各段pH及主要消化酶活性的影响,选用55只初生重为(3.43±1.15)kg的甘肃现代肉羊育种群哺乳公羔,按同质原则分成3组,即对照组(正常吮乳组,25只)、Ⅰ组(28日龄断奶组,15只)和Ⅱ组(42日龄断奶组,15只)。在断奶12h、7d和14d后从每个处理中随机抽取5只羔羊屠宰,测定小肠各段pH、α-淀粉酶、胰蛋白酶、糜蛋白酶和脂肪酶活性变化。结果显示,十二指肠食糜能够更为敏感地表达断奶对小肠pH及主要消化酶活性的影响。从小肠近端至远端,断奶对各肠段内容物pH及主要消化酶活性的影响逐渐减弱;断奶对小肠内容物pH、胰蛋白酶活性和脂肪酶活性影响较小;断奶日龄对羔羊小肠主要消化酶活性恢复所需要的时间影响不大,28日龄断奶组小肠α-淀粉酶活性恢复时间较42日龄断奶组短。本试验条件下,对羔羊实施28日龄断奶可行,且羔羊小肠主要消化酶活性恢复能力不逊于42日龄断奶羔羊。
[Abstract]:In order to study the effect of early weaning age on pH and main digestive enzyme activity in small intestine of lambs, 55 male lambs of Gansu modern mutton breeding group with birth weight of 3.43 卤1.15)kg were divided into 3 groups according to the homogeneity principle.There were 25 rats in the control group (normal suckling group, 15 rats in the 28 day weaning group) and 15 rats in the 42 day weaning group in the second group.Five lambs were randomly selected from each treatment for slaughter after 12 hours of weaning for 7 days and 14 days. The pH, 伪 -amylase, trypsin, chymotrypsin and lipase activities in the small intestine were measured.The results showed that duodenal chyme could more sensitively express the effects of weaning on intestinal pH and main digestive enzyme activity.The effects of weaning on pH and main digestive enzyme activities of intestinal contents gradually decreased from proximal to distal end of small intestine, and the effects of weaning on pH, trypsin activity and lipase activity of intestinal contents were relatively small.The effect of weaning age on the recovery time of main digestive enzyme activity in small intestine of lamb was not significant. The recovery time of 伪 -amylase activity in small intestine of 28 days old weaning group was shorter than that of 42 days old weaning group.Under the experimental conditions, it is feasible to wean the lamb at 28 days of age, and the recovery ability of the main digestive enzyme activity in the small intestine of the lamb is no less than that of the weaned lamb at the age of 42 days.
【作者单位】：北京市畜牧总站;甘肃农业大学动物科学技术学院;兰州大学草地农业科技学院;山东东阿阿胶股份有限公司;大同市良种奶牛有限责任公司;
【基金】：现代农业产业技术体系建设专项资金甘肃省自然科学基金(3ZS061-A25-077) 甘肃省教育厅高等学校研究生导师科研项目(0702-07)
【分类号】：S826

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