Abstract
The authors traced the growths of rats fed with various synthetic diets lacking in one of the amino acids known to be, essential in their growth.The weight loss varied depending upon the sort of missing amino acid, and the characteristics of rat growth in the results appeared to fall into four groups:
(1) On the diets lacking in isoleucine, threonine or valine, the rate of weight loss was extremely rapid.
(2) On the diets lacking in leucine, tryptophan, or mf.thionine, the feature vas similar to the case on the diet lacking all kinds of amino acids.
(3) On the diet lacking in lysine, histidine, or phenylalanine, the rate of weight loss was relatively slow.
(4) On the diet lacking in arginine, the weight increased, while the rate was less than that of the control.
The higher the nitrogen content of the isoleucine deficiency diet fed on the rats, the more rapid was the weight decresse, while, on the diet lacking in lysine or threonine, the rate of weight decrease was not influenced with nitrogen content in the diet.
