Effects of Rumen Protected Methionine on Milk Yield and Milk Composition in Earlier Lactating Cow

摘要

A total of 12 mature healthy Holstein dairy cows of the nearly body weight(580 ± 30) kg,milk yield(22.5 ± 2.8) kg in the early stages of lactation were selected in this experiment.The cows were randomly divided into 2 groups,every group had 6 cows,every group had 6 repeats,and every repeat had 1 cow.Added 20 g protected methionine in earlier lactating cow food every day.The results showed that protected methionine increased milk yield by 10.83%,testing group milk yield was significantly different than that of control(P0.05);dry matter of milk had the tendency of decrease,but had insignificant difference(P>0.05).