小麦替代玉米对藏系绵羊瘤胃发育的影响

Effect of Wheat Replacing Corn on Rumen Development of Tibetan Sheep

【目的】试验旨在分析使用10%小麦粉替代精料中玉米对高原型藏羊复胃形态发育及瘤胃消化酶活性与抗氧化特性的影响。【方法】选择体况良好、胎次一致且初始体重相近的2~3月龄高原型藏羊公羔60只,随机分为两组,每组5个重复,每个重复6只羊。对照组饲喂玉米饲粮,试验组饲喂10%小麦粉替代精料中玉米。试验分为预饲期10 d和正试期90 d。【结果】(1)与对照组相比,试验组瘤胃的角质层厚度,网胃的乳头长度、乳头宽度以及皱胃的黏膜层厚度显著提高(P<0.05);(2)试验组瘤胃的胰蛋白酶活性显著高于对照组(P<0.05);(3)相较于对照组,试验组瘤胃的丙二醛含量显著下降(P<0.05);(4)两组间瘤胃的pH值差异不显著(P>0.05)。【结论】使用10%小麦粉替代精料中玉米可促进高原型藏羊复胃形态发育,同时能增强瘤胃消化酶活性与抗氧化能力。

[Objective] The purpose of the experiment was to analyze the effects of replacing corn in concentrate with 10% wheat flour on the development of regurgitation morphology,rumen digestive enzyme activity and antioxidant properties of plateau Tibetan sheep.[Method] Total 60 male plateau-type Tibetan lambs of 2-3 months old with good body condition,consistent parity and similar initial weight were selected and randomly divided into two groups, with 5 replicates in each group and 6 sheep in each replicate.The control group was fed with corn diet,and the test group was fed with 10% wheat flour instead of corn in concentrate.The trial was divided into pre-feeding period of 10 days and post-trial period of 90 days.[Result]①Compared with the control group,the thickness of the stratum corneum in rumen,the length and width of the papilla of reticulum and the thickness of the mucosal layer of abomasum in the experimental group were significantly increased(P<0.05);②The activity of trypsin in rumen for test group was significantly higher than that in control group(P<0.05);③Compared with the control group,the content of malondialdehyde in the rumen of the test group was decreased significantly(P<0.05);④There was no significant difference in rumen pH between the two groups(P>0.05).[Conclusion] To sum up,the use of 10% wheat flour instead of corn in concentrate can promote the development of rumen morphology of plateau Tibetan sheep,and enhance rumen digestive enzyme activity and antioxidant capacity.