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Utilization by Normal Adult Subjects of the Calcium and Phosphorus in Raw Milk and in Ice Cream^{*, ,}

(From the Kansas Agricultural Experiment Station, Manhattan)

A metabolism study was made to compare the utilization by 10 normal adult subjects of the calcium and phosphorus in raw milk and ice cream. The diet was somewhat acid-forming as is common throughout this country. Five of the subjects received ultra-violet irradiations daily.

No special advantages in the utilization of calcium and phosphorus seemed to be conferred upon those subjects who received ultra-violet irradiations, as described, throughout the 18 days of the experiment.

Four of the non-irradiated and three of the irradiated subjects showed more favorable calcium balances when ice cream was the chief source of calcium. Normal adult subjects on an acid-forming diet utilized the calcium from ice cream made with condensed milk at least as well as the calcium of raw milk. In general the phosphorus balances followed the trend of the calcium balance figures.

Acknowledgment is made to Professors J. B. Fitch and W. H. Martin and to Mr. W. J. Caulfield of the Department of Dairy Husbandry, this college, through whose kind cooperation suitable supplies of ice cream and milk were made available for the experiments.

Manuscript received 14 July 1930.