Abstract
A rapid procedure for the extraction of the fecal fat of rats used in digestion trials is presented. Data obtained by this method demonstrate a marked variation among individual rats of both sexes in the digestion of fat. This variation appears to be greater in adult males; however, restricting the fat intake of the adult male to that of the female lessened the variation. When fed ad libitum, mature females digested more fat than males. This sex difference was not apparent when the fat intake of the males was restricted to that of the females or when young growing rats of either sex were kept on ad libitum or restricted feeding regimens. Since variations in utilization were found to occur with the type of fat, sex and age of the rats and feeding regimen, the importance of standardizing procedures for determining fat digestion coefficients with rats is indicated.
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