Investigations into vitamin A-free basal diets. III

SOME years ago a series of investigations was begun in these laboratories with the object of achieving as close an approximation as possible to the "ideal" basic diet for vitamin assay, and in particular for the assay of vitamin A by the "curative" procedure generally used. Two papers were published In 1934 we began to introduce further modifications into our vitamin A-free basal diet; by 1936 we regularly employed a diet having the following composition: Diet F Parts Rice starch 50 Arachis oil 10 Casein (alcohol-extracted) 20 Fed as a paste with water. Every Salt mieture* 51 animal receives also 0k375,g. o Dried yeast 5 calciferol per week Yeast extract 2.5