白米飼育シロネズミに対するリジン, スレオニン, トリプトファン, メチオニン添加の効果

Abstract

The nutritional effect of the addition of L-lysine, DL-threonine, DL-tryptophan, and DL-methionine to polished rice was examined on rats fed on polished rice powder (protein content 5-6%) or on that added with protein extract from rice (protein content 18%) as the single protein source.The results of the experiments were summarized as follows.(1) The activity of the xanthine oxidase of the liver of rats fed on polished rice powder added with these amino acids increased in company with the growth of rats. The nutritional value was estimated to be almost equal to casein, and these observations indicated that the addition of these amino acids to polished rice powder offered a complete protein nutrition.(2) When the rice protein content was 18% of the total food, no significant difference was found in the growth of rats and the activity of xanthine oxidase between the group of rats fed on rice protein added with these amino acids and the group fed on diet without the additions.