Studies on the Comparative Nutritive Value of Fats

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Abstract
Experiments are reported on reproduction and growth rate of ten generations in which the lineage is through the first litter and of eight generations in which the lineage is through the second litters where the diets have been a modification of the Sherman diet B in which butterfat has been replaced by vitamin A-fortified margarine fat. The growth rate considerably exceeded that obtained with animals on our stock diet and progressively improved with the later generations. Somewhat faster growth was obtained with the first litter rats than with those in the second litter group. It is concluded that a vegetable fat such as that contained in a margarine can serve adequately in place of butterfat for growth and reproduction on a diet otherwise nutritionally satisfactory.