Effect of rumen-protected methionine supplementation on feed efficiency and performance of post-weaning growing Charolais bulls fed a high-forage diet

摘要

Improvements of gain in response to supplementation with rumen undegradable protein in growing cattle fed high-forage diets indicate that rumen-bypass protein may correct for AA deficiency and increase protein deposition (Titgemeyer and Loest, 2001).Because methionine (Met) has been identified as the first limiting AA for ruminant growth from microbial protein (Storm and 0rskov, 1984), which is the predominant metabolizable protein source in forage-fed ruminants, Met can be expected to be a limitingAA in growing beef cattle fed high-forage diets (Titgemeyer and Merchen, 1990). The objective was to evaluate the gain in feed efficiency (FE) and beef cattle performance when high-forage diets formulated at two protein levels (High vs Normal) were supplemented with rumen-protected Met (RP-Met) in post-weaning growing Charolais bulls.