[目的]研究日粮添加竹叶提取物对奶牛泌乳量、乳成分和血液指标的影响。[方法]选择月龄（26 月左右）、泌乳天数（70±2）d、泌乳量（30±2）kg/d、胎次（1 胎）相近的健康荷斯坦牛50 头,随机分成试验组和对照组,每组25 头,每组重复1 头牛。对照组奶牛饲喂基础日粮,试验组奶牛饲喂基础日粮加30 g/d·头竹叶提取物,预试期7 d,正试期60 d。[结果]与对照组相比,试验组添加竹叶提取物饲喂奶牛泌乳量提高2.64%（P>0.05）,奶尿素氮、体细胞数含量有下降趋势（P>0.05）,血常规和血清生化指标均不显著（P>0.05）,其中,总蛋白、白蛋白和球蛋白有增高趋势。[结论]日粮添加竹叶提取物虽对奶牛泌乳量、乳成分和血液指标均无显著影响,但一定程度上有利于提高奶牛泌乳量和血清蛋白质含量,降低乳尿素氮浓度和体细胞数。

[Objective]To investigate the effects of adding bamboo leaf extract to milk yield,milk composition,and blood indexes in dairy cows.[Method]50 healthy Holstein cows with similar age（around 26 months）,lactation days（70±2）d,milk yield（30±2）kg/d,and parity（1 fetus） were selected and randomly divided into an experimental group and a control group,with 25 dairy cows in each group and 1 cow in each group.The control group cows were fed a basic diet,while the experimental group cows were fed a basic diet with 30 g/d·head bamboo leaf extract.The pretrial period was 7 days,and the trial period was 60 days.[Result]Compared with the control group,the experimental group fed with bamboo leaf extract increased milk yield by 2.64%（P>0.05）,and there was a downward trend in milk urea nitrogen and somatic cell number content（P>0.05）.Blood routine and serum biochemical indicators were not significant（P>0.05）,with an increase trend in total protein,albumin,and globulin.[Conclusion]Under the conditions of this study,although the addition of bamboo leaf extract to the diet did not significantly affect milk yield,milk composition,and blood indexes,it was beneficial to some extent to increase milk yield and serum protein content,and reduce milk urea nitrogen and somatic cell number content.