Abstract
Summary
Results of experiments are given which show that for optimum growth in rats, it is necessary to add at least one factor besides vitamin A to the U.S.P. Vitamin A-free diet. This factor, which has been described by other investigators, is present in liver extract. Replacement of half of the casein in the basal diet either with pork or sardine meal was likewise effective and the addition of liver extract to these ingredients did not give any added benefit. Unfortunately, extraction with ether failed to remove the vitamin A from blood fibrin to make possible its use. Excepting the groups fed blood fibrin the sardine meal diet with supplements promoted the best gains of all the remaining groups.
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