Effect of Dietary Excess and Deficiency of Individual Amino Acids on Performance and Protein-and Energy-retention in Growing Rats

Abstract

In the present study to examine the relative nutritional functions of amino acids in animal bodies, the effects of both deficient and excess levels of 9 individual L-amino acids were in-vestigated by the carcass retention method as well as by growth assay. The result indicated that these amino acids can be classified into at least four different groups by their effects on the retention to consumption relationships of protein and energy; one for arginine and iso-leucine, one for lysine, one for tryptophan and one for valine, leucine, threonine, methionine and phenylalanine.