布鲁氏菌病对荷斯坦牛泌乳性能的影响

目的]研究不同产犊季节、胎次及泌乳阶段布鲁氏菌病对奶牛泌乳性能的影响。方法]收集南方地区某奶牛场297头奶牛2014年的DHI生产性能测定记录,采用多因素方差法分析布鲁氏菌病阴性与阳性奶牛不同产犊季节、胎次和泌乳阶段对奶牛泌乳性能(日产奶量、体细胞数、体细胞评分、奶损失、尿素氮、产奶高峰日、90 d产奶量)的影响。结果]不同产犊季节、胎次和泌乳阶段对奶牛的体细胞数、体细胞评分、奶损失、高峰日的影响达到极显著水平(P0.01),而对其他泌乳性能无显著影响。布鲁氏菌病对荷斯坦奶牛的日产奶量、体细胞数、体细胞评分、奶损失、产奶高峰日具有极显著影响(P0.01),对尿素氮和90 d产奶量的影响达到显著水平(P0.05),不同产犊季节、泌乳阶段、胎次、测定季节等对奶牛的生产性能均有一定的影响。结论]该研究结果可为提高奶牛的泌乳性能及牛奶质量提供可靠的理论依据。

Effects of Brucellosis on the Lactation Performances of Holstein Cows

Objective] To study the effects of brucellosis in different calving season,parity and lactation stages on the lactation performances of dairy cows.Method] The measurement records of DHI production performance of 297 cows in 2014 were collected from a dairy farm in southern regions of China.The effects of different calving seasons,parity and lactation stage in dairy cows with negative and positive detection results of brucellosis on the lactation performances (daily milk production,somatic cell count,somatic cell score,milk loss,blood urea nitrogen,lactating peak day,90 d milk yield) were analyzed by using multi-factor analysis of variance.Result] Different calving season,parity,lactation stage had extremely significant effects on the somatic cell count,somatic cell score,milk loss and lactating peak day of dairy cows (P ＜ 0.01),but they had no significant effect on other lactation performances.Brucellosis had extremely significant effects on daily milk production,somatic cell count,somatic cell score,milk loss,lactating peak day of Holstein Cows(P ＜ 0.01) and had significant effects on urea nitrogen and 90 d milk yield(P ＜ 0.05).Brucellosis in different calving season,lactation stage,parity,and determination seasons had some influences on the production performances of dairy cows.Conclusion] The research can provide reliable theoretical basis for improving the lactating performance and milk quality of dairy cows.