Résumé
35 rats were divided into 5 groups. Group 1-3 were fed rations containing 20, 12 and 6% caseien respectively, group 4 containing 12% mixed protein of soybean and gluten. The food of group 5 was the same as that of group 1 but the amount was only half of that of group 1. Every animal was given 8?g vitamin A by stomach tube daily for 3 weeks and then 25?g for 2 weeks. Afterward serum vitamin A values were determined in all animals, then 132?g vitamin A was administrated by stomach tube. After 3.5 hours, the vitamin A values in serum and liver were determind. The results showed that in group 3 and 5 serum vitamin A contents decreased and the liver values rose. It was suggested that the release of vitamin A from liver had been interfered by semistarvation or low protein intake. There is no difference between group 2 and 4.