[目的]探究复方中药对奶牛回乳效果的影响。[方法]选用60 头妊娠后期、胎次相近、体况健康的中国荷斯坦牛,随机分为4 组,每组15 头。Ⅰ组为对照组,不饲喂复方中药。Ⅱ、Ⅲ和Ⅳ组分别饲喂100 mg/kg、200 mg/kg和400 mg/kg复方中药。记录各组奶牛平均日产奶量,检测第0、1、3、5、7、9和11天奶牛血清催乳素（PRL）、转化生长因子β1（TGF-β1）和转录激活因子5（STAT5）含量。[结果]各组奶牛产奶量在回乳期间处于下降趋势,Ⅰ~Ⅳ组回乳时间分别为11 天、7 天、7 天和5 天。回乳期间各组奶牛血清PRL和STAT5含量呈逐渐降低趋势,TGF-β1含量逐渐升高。[结论]复方中药可促进奶牛回乳及上述泌乳因子含量变化。

[Objective]To explore the effect of compound traditional Chinese medicine on milk return of dairy cows.[Method]60 Chinese Holstein cows with similar parity and healthy body condition were randomly divided into 4 groups,15 in each group.Group I was the control group and did not feed the compound traditional Chinese medicine.Group II,III and IV were fed 100 mg/kg,200 mg/kg and 400 mg/kg of compound traditional Chinese medicine respectively,and the average daily milk yield of each group was recorded.The contents of prolactin （PRL）,transforming growth factor β1（TGF-β1） and transcription activator 5（STAT5） in serum of cows at day 0,1,3,5,7,9 and 11 were determined.[Result]The milk yield of dairy cows in each group was in a downward trend during the lactation period,and the lactation time of group I~IV was 11 days,7 days,7 days and 5 days respectively.During lactation,the contents of PRL and STAT5 in serum of dairy cows in each group showed a trend of gradual decrease.The content of TGF-β1 increased gradually.[Conclusion]The compound Chinese medicine can promote the milk return of dairy cows and the content change of the above lactation factors.