Vitamin Content of Bee Foods. III: Vitamin A and Riboflavin Content of Bee Bread*

Abstract
A biological assay is descr. in which laboratory rats were fed various levels of bee bread in order to evaluate the vitamin A activity and riboflavin content of this food of honey bees. The vitamin A activity of bee bread is equal to that of 6 I. U. and 8.4 I. U. per g. of fresh and dry matter respectively. The riboflavin content was equal to 20[gamma] per gram of fresh and 28[gamma] per g. of dry matter of bee bread.

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