Effect of lysine and threonine supplements on nitrogen compounds in the urine of rats fed polished rice.

Growth rate of young rats and ratio of retained nitrogen in absorbed nitrogen were capable of measuring the effect of supplement of a diet containing 85% of polished rice with 0.2% L-lysine hydrochloride and 0.24% DL-threonine.Although weaning male rats grew at approximately the same rate when they were fed on diet C (a 85% polished rice diet supplemented with 0.2% L-lysine hydrochloride and 0.24% DL-threonine) and diet D (the same diet as diet C except that double amount of L-lysine hydrochloride was added), ratio of retained nitrogen to absorbed nitrogen and ratio of urinary allantoin to urinary urea of rats fed on diet D were significantly higher than those of rats fed on diet C.