Forage Digestibility, Benzene-Ethanol Extracts of Forage and Feces as Indicators of Digestibility

Abstract

the above findings, although neither amino acid alone resulted in improved growth. The addition of both, however, improved growth, feed efficiency, and protein efficiency. This suggests that both are limiting to about an equal degree. Even with the addition of these two amino acids, however, or with the addition of seven amino acids, the growth was only 88% of that obtained with skim milk. There are, apparently, other limiting amino acids besides methionine and threonine, a situation which could be due either to a lack in availability or to the fact that the amounts of threonine and methionine added were not adequate for maximum improvement in growth.To obtain a maximum response to an amino acid addition, it is necessary to add the optimum amount of the most limiting amino acids (22).