摘要
研究胎衣不下在不同年度、季节、产犊季节、泌乳阶段、胎次对奶牛泌乳性能的影响,以期为提高奶牛泌乳性能及牛奶质量提供可靠的理论依据。收集某奶牛场4 247头奶牛2013至2015年度DHI生产性能测定记录,用多因素方差法分析产后胎衣不下奶牛在不同测试年、测定季节、产犊季节、胎次和泌乳阶段对奶牛泌乳性能的影响。结果表明:在不同产犊季节、测定季节、测试年、泌乳阶段和胎次情况下,胎衣不下对奶牛日产奶量、体细胞评分、乳糖和尿素氮这4项指标均有显著影响(P<0.05)。春、夏、秋季产犊胎衣不下奶牛日产奶量显著低于胎衣正常排出奶牛(P<0.05),泌乳前期胎衣不下奶牛的日产奶量显著低于胎衣正常排出奶牛(P<0.05)。秋冬季测定的胎衣不下奶牛日产奶量显著低于胎衣正常排出奶牛(P<0.05)。第1胎、3胎胎衣不下奶牛的日产奶量显著低于胎衣正常排出的奶牛(P<0.05)。
To study the effect of placenta retention on lactation performance of dairy cows in different year,season,calving season,lactation stage and parity,and in order to provide a reliable theoretical basis for improving the lactation performance and milk quality of dairy cows.A total of 4247 dairy cows' DHI production performance recorded were collected from 2013 to 2015,the lactation performances of dairy cows were measured by multiple factor variance(ANOVA)in different year,season,calving season,parity and lactation stage.The results showed that:the 4 traits of milk production,including somatic cell score,lactose and milk urea nitrogen were significantly affected(P<0.05)by dairy cows with placenta retention in different calving season,season,year,lactation stage and parity.Placenta retention cows with spring,summer and autumn calves,had a lower significant effect on daily milk production than the normal cows(P<0.05).Placenta retention cows with early lactation calves,had a lower significant effect on daily milk production than the normal cows(P<0.05).Placenta retention cows tested in autumn and winter,had a lower significant effect on daily milk production than the normal cows(P<0.05).Placenta retention cows with first and third parity calves,had a lower significant effect on daily milk production than the normal cows(P<0.05).
出处
《家畜生态学报》
北大核心
2017年第12期67-72,共6页
Journal of Domestic Animal Ecology
基金
江苏省苏北专项(BN2016027)
江苏企业研究生工作站资助项目
关键词
胎衣不下
荷斯坦牛
泌乳性能
placenta retention
Holstein cows
lactation performances
