Effects of Cholesterol Supplementation on Reproductive Performance and Serum Biochemical Indexes in Hu Sheep Ewes under High Temperature Environment
[Objective]The aim of this study was to investigate the effect of cholesterol supplementation on estrus rate,conception rate and serum biochemical indexes of Hu sheep in southern summer of China.[Method]108 healthy Hu sheep ewes with similar body weight(33.60 kg±1.86 kg)were selected,and 30 ewes were fed with different doses of cholesterol(0.1％ and 0.5％)and detect the dynamic changes of serum cholesterol content in April(non high temperature state,average highest temperature is 20.9 ℃±3.2 ℃)to select the appropriate dose of cholesterol.Another 78 Hu sheep were randomly divided into two groups,and the experimental period was 63 days(from the first day of estrus synchronization to the 30th day of mating after natural estrus),the ewes in control group were fed with basic diet,and the ewes in experimental group were fed with basic diet supplemented with cholesterol from July to September(high temperature state,average highest temperature is 31.3 ℃±2.6 ℃),and the effects of dietary cholesterol on the estrus rate,conception rate and serum biochemical indexes of Hu sheep were studied.[Result]No matter whether 0.1％ or 0.5％ holesterol was supplemented to the basic diet under non high temperature state,the cholesterol content in serum of the two groups tended to be the same after 48 h,so 0.1％ cholesterol was selected for the supplementary feeding experiment in the diet of high temperature environment.Supplemental feeding of 0.1％cholesterol on the 3rd,30th and 63rd days could significantly increase the serum cholesterol content of Hu sheep,and the natural estrus rate(89.7％)of the experimental group were higher than those of the control group(82.1％)(P＞0.05),the conception rate of the experimental group(60.0％)was significantly higher than that of the control group(46.9％)(P＜0.05).The content of total protein(TP),globulin(GLB),IL-1 and triglyceride(TG)in the experimental group were significantly higher than those in the control group(P＜0.05),while the content of urea nitrogen was significantly decreased(P＜0.05).[Conclusion]Adding 0.1％cholesterol to the diet of Hu sheep ewes in high temperature season could enhance its estrus rate and conception rate.
Hu sheephigh temperature environmentcholesterolestrus rateserum indexes
国家科技期刊平台
NSTL
万方数据
维普
