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The Digestion and Absorption of P³² Labeled Casein by the Young Calf¹

Three Figures

Division of Animal Husbandry, University of California, Davis

Studies are reported on the rate of absorption of P³² by calves fed labeled casein, and comparisons are made with similar calves fed or injected with the isotope in inorganic form. Tissue distribution of the P³² was determined 24 hours after feeding.

The results show that the digestion of casein is initiated rather rapidly and is prolonged over the 24-hour period. When labeled inorganic phosphate is added to the milk, absorption takes place in a much different pattern.

Tissue distribution of the isotope indicated that it is probable that the calf absorbs inorganic phosphate even when it is fed in the organic form as phosphoprotein. Liver and kidney consistently showed rapid phosphate exchange rates, while brain tissue rates were notably slow. The omasum, rumen and jejunum appeared to have high phosphate exchange rates in comparison to other sections of the gastrointestinal tract.

² Division of Poultry Husbandry.

Manuscript received 27 October 1950.