| Popis: |
MELLANBY (1921) was the first to demonstrate the antirachitic properties of egg yolk. It is now recognized that, with the exception of fish oils, egg yolk is the only natural food which contains an appreciable quantity of vitamin D. Investigations of the vitamin D content of egg yolk have been reviewed by Branion, Drake, and Tisdall (1934) and by Bethke, et al (1936). It has been shown that the vitamin D content of eggs depends upon the amount and source of the vitamin in the diet of the hen, the amount of irradiation which the hen receives, and the rate of egg production. The purpose of the present experiment was to make a vitamin D essay of certain egg and egg oil products and to determine the extent to which the vitamin D content of these substances could be increased by irradiation. EXPERIMENTAL AND RESULTS The substances assayed were a . . . |
