Tian Wenru;Gou Zhcnzhong;Li Shoujun;Ma Yanrong;He Jianbin

;Northeast Agricultural University, Harbin 150030 P.R.C

bospro;cow;milk content;milk yield

A total of 90 cows from two farms (farm A 30 cows, farm B 60 cows) were used to study the effect of Bospro on milk production, milk quality and subclinical mastitis incidence. The cows in the test group were supplied with 20 g of Bospro per head per day and meanwhile, the percentage of milk fat, protein and lactose and moisture of the milk samples were analysed. The results showed that the milk yield of both high production and mid—to—low milk producting cows increased by 3.3% to 5.3% respectivelycompared with their control group of cows, but there was no changes on the milk content between the treated and the control cows. The treated cows also showed an increased body weight (p>0.05) and significantly reduced incidence of mastitis, as comparedwith that of the control group. The experiment dcmonstrats that Bospro can increase milk yield, but not at the expense of milk quality and body weight.