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Utilization of Meat by Human Subjects¹

III. The Utilization of the Nitrogen and Phosphorus of Beef Heart

Kansas Agricultural Experiment Station, Manhattan

Four college women seemingly used the nitrogen of beef heart at least as well as that from beef round as indicated by practically identical coefficients of digestibility and losses of urinary nitrogen. A higher nitrogen balance for heart may probably be explained by a somewhat higher nitrogen intake.

Differences in utilization of phosphorus from the two meats, which were also in favor of beef heart, were not great and probably were also due to level in the diet. The heart contained more connective tissue than the round, but, as the balances for both nitrogen and phosphorus were slightly higher for this meat, it apparently did not prevent good usage of these elements.

Daily variations in the nitrogen and phosphorus metabolism of an individual subject and differences between subjects were often greater than the differences in availability of these elements from the two meats.

Manuscript received 7 January 1935.