Influence on milk yield and milk composition of cows feed with sweet sorghum straw fermented by compound microbial agent in bags

Sixteen cows were selected from the dairy herd of similar weight,parity,lactation,milk pro-duction and feed intake,8 for experimental group,8 for the control group.The effects of the sweet sorghum straw fermented by the compound microbial agent on the milk yield and milk composition of the cows were researched.Results showed that the fermented sweet sorghum straw increased the content of crude pro-tein,with 7 1% higher compared the control,and the content of FIB reduced by 8%.Fermented sweet sor-ghum straw increased the feed intake (11.4%)and milk yield (14.2%),and the milk-feed ratio in the ex-perimental group decreased by 20.8%.In addition,the milk protein and milk fat content in experimental group increased by 14.03% and 16.3%.Milk somatic cell count decreased by 5.15%.