畜牧与兽医2018，Vol.50Issue(3)：1-5,5.
影响荷斯坦牛妊娠期长短的因素分析
Factors affecting the gestation length of Chinese Holstein cows
摘要
Abstract
Gestation length is one of the important traits that affect the reproductive performance of cows and the economic benefits of farms.A total of 7 164 healthy and normal calving records of Chinese Holstein cows were made on a large dairy farm in Jiangsu Province from January 2016 to April 2017.A general linear model was used to analyze the effects on gestation length by the following factors:calf sex,parity,calving seasons,twin calving,body weight of newborn calves,body condition score of calving cows and use of sex controlled semen.The results showed that parity,calf sex,calving seasons,twin calving,body weight of newborn calves,body condition score of calving cows and use of sex controlled semen had significant effects on gestation length (P＜0.01);the second pregnancy cows had longer gestation length than the other cows;cows giving birth to female calves had longer gestation than those giving birth to male ones;the cows that calved in spring had the longest gestation and those that calved in winter had the shortest one;the higher the body condition scores of calving cows were,the shorter the gestation was;the higher the body weight of the newborn calves was,the longer the cow's gestation was;the cows treated with sexing semen had shorter gestation than those treated with natural semen;but twin calving did not have significant effect on gestation length (P＞0.05).The above results provide scientific basis for regulating gestation length of cows to improve reproductive performance of caving cows and economic benefits of dairy farms.关键词
中国荷斯坦牛/妊娠期/影响因素Key words
Chinese Holstein cows/gestation length/influencing factors分类
农业科技引用本文复制引用
王梦琦,刘洵,毛永江,倪炜,夏海磊,郭佳禾,黄云华,张强,张慧敏,李明勋,杨章平..影响荷斯坦牛妊娠期长短的因素分析[J].畜牧与兽医,2018,50(3):1-5,5.基金项目
江苏省苏北专项(BN2016027) （BN2016027）
江苏省农业自主创新基金(CX(17)1005) （CX(17）
江苏企业研究生工作站资助项目 （）
