Effect of Vitamin B12 and Amino Acid Imbalances on Growth and Levels of Certain Blood Constituents in the Chick

Fatty Livers Induced by Amino Acids and Influence of Other Amino Acids on Them

“…The growth inhibiting action of methionine is alleviated in the presence of an appropriate amount of glycine or arginine (7,8.9). Giving glycine in excess, however , has been reported to be rather inhibitory on growth (8,10,11). According to Hsu et al("), leucine, glutamic acid and aspartic acid also inhibit growth of the chicken when these amino acids are supplied in excess.…”

Metabolism of branched-chain amino acids in avian species

“…In the same paper, a depressive effect on growth was observed with addition, of 10 percent leucine to a 20 percent protein chick diet. Hsu and Combs (1952) also found the addition of zein or leucine to a chick diet resulted in growth inhibition. They attributed the growthdepressing action of zein to its leucine content.…”