Abstract
The weight and riboflavin content of various tissues of healthy mice were measured in the stages of non-pregnancy, pregnancy and lactation. Liver weight in pregnancy indicated a tendency of increasing as compared with that in non-pregnancy, but there was no marked change in the weights of the heart and kidney independently of pregnancy. A decrease of riboflavin content was recognized in the liver in both pregnancy and lactation, especially in the latter and the vitamin content of the whole liver decreased, while no significant change was found in the vitamin content of heart and kidney.
