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.
国家科技期刊平台
NSTL
万方数据
维普
