Evaluation of 2-Hydroxy-4-(methylthio) Butanoic Acid Isopropyl Ester and Methionine Supplementation on Efficiency of Microbial Protein Synthesis and Rumen Bacterial Populations
Year: 2009
Type: article
Abstract: Because microorganisms that grow in the rumen flow to the abomasum and are digested, the primary source of protein for milk production is of microbial origin, so increasing microbial protein supply should either increase milk protein or decrease the need for expensive bypass protein.Moreover, improving the consistency of prediction of microbial protein supply decreases the amount of protein that must be fed to the dairy cow, reducing urinary N excretion and decreasing feed costs.Methionine is co-limiting with lysine in most dairy diets.2-hydroxy-4-(methylthio) butanoic acid (HMBi) is a methionine precursor for bacteria and might be degraded more slowly and, therefore, might be sustained longer over the feeding cycle for bacterial uptake or absorption than methionine itself.HMBi has been shown to increase nitrogen efficiency, expressed as the proportion of ingested nitrogen secreted in milk, when supplemented to dairy cows, but its mode of action (rumen microbial protein synthesis, delayed absorption, or both)
Author: C.M. Fowler
Institution: The Ohio State University
Language: English
Subfield: Animal Science and Zoology
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2617452788