Abstract
On the two diets containing 8.2% and 15% flour protein, additional D-lysine gave no effects for growth of young rats.
Nitrogenous components and basic amino acids in the urine of rats fed above two basal diets to which were supplemented with L-, DL- and D-lysine, respectively, were analysed.
In the urine of rats fed the 8.2% protein basal diet supplemented with L-lysine, the percentage of allantoin was higher than the other groups.
The amounts of lysine excreted into the urine were about 1/5-1/3 of D-lysine intake in all rats fed with D- and DL-lysine. It was found that an unknown substance which was colored by ninhidrin reagent was excreted into the urine of rats fed D-lysine. These facts show that a large portion of Dlysine are catabolized in the body and give certain effects on the nitrogen metabolism.
