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Transfer of Phosphate in the Digestive Tract

I. Swine¹

Department of Animal Husbandry, University of California Davis

The distribution in swine of intravenously injected radiophosphate at various times after its administration indicates a very large and rapid transfer of plasma inorganic phosphorus to the gastrointestinal contents and tissues. Most of this endogenous phosphorus appears to enter the contents of the small intestine, which, 6 hours after injection in the 8-months-old swine, has a specific activity greater than most tissues and organs, being exceeded only by the liver and kidney. A decreasing specific activity of the contents toward the posterior portion of the digestive tract indicates that the endogenous phosphorus is resorbed from the lower intestinal contents to a much greater extent than the food phosphorus. Ageing markedly decreases the secretion of endogenous phosphorus (as compared with the circulating inorganic phosphorus) and also decreases the rate of uptake of circulating inorganic phosphorus by the gastrointestinal tissues.

² Postdoctoral fellow of the U.S. Atomic Energy Commission. Present address: Department of Poultry Husbandry, University of California, Davis.

³ Predoctoral Fellow of the U.S. Atomic Energy Commission.

Manuscript received 25 July 1955.