Microbial Protein Biosynthesis in the Rumen

Abstract

Semipurified and conventional diets with and without diethylstilbestrol (DES) were fed to four tureen fistulated dairy cows in a 4 x 4 Latin square design. Feed was limited to 10 kg daily and fed at intervals of 2 min. Amino acid composition of experimental diets, protozoa, bacteria, and rumen digesta were determined. Erperimental diets did not affect (P<.05) amino acid composition of the bacterial protein. Lysine, proline, phenylalanine, and methionine content of protozoa were affected (P<.05) by the experimental diets.