Supplementation of Urea Level and Malate in Concentrate Containing High Cassava Chip on Rumen Ecology and Milk Production in Lactating Cows

摘要

Four, lactation dairy cows were randomly assigned according to a 2 x 2 Factorial arrangement in a 4 x 4 Latin square design to study supplementation of urea level (U) at 2 and 4 % and malate (M) at 10 and 20 g/hd/d in concentrate. The treatments were as f