Abstract
Thirty four albino rats were fed for five months with rice powder as basal diet fortified with 0.2% of L-lysine.The protein level of the diet was 6.2%. Another fourteen rats were fed for thirty days with rice powder fortified with alkali extract, of rice protein and 0.2% of L-lysine. The protein level was amounted to 10%.
The effects of the supplemented D-, DL- and L- threonine, 0.25, 0.5 and 0.25% level, respectively, to the lower protein diet above cited, and 0.25% D- and L-threonine to the higher one were examined by the comparison of the growth rate, liver weight, liver fat and nitrogen level and the liver xanthine oxidase activity.
The growth rate of the animals with 10% protein level were higher than that of 6.2% level, but no effects of supplemented threonine were observed.
Activities of liver xanthine oxidase were higher in L-threonine group, than in D-group, but the difference was minimized between the groups of higher protein level.
The liver nitrogen level was higher in the group of higher protein level, but no difference was observed in the nitrogen as well as fat level between D-and L-threonine supplemented groups.
