Effects of low-protein diet supplemented with yeast culture on performance of lactating dairy cows, blood parameters and rumen microbes

The trial adopted a completely randomized trial design, and 32 Holstein lactating cows with the same lactation days, parity and similar milk production were randomly divided into 4 groups, with 8 replicates in each group, and were fed 4 diets: control group (CP16.20%), trial 1 group (CP14.50%+AA), trial 2 group (CP14.50%+YC), and trial 3 group (CP14.50%+AA+YC).