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Distribution of Intravenously Injected Radioactive Phosphorus (P³²) among Swine Tissues¹

University of California^,4

Abstract

The distribution of intravenously injected radioactive phosphate in the tissues of swine of different ages, and at different times after injection is reported. There is considerable variation between the various tissues regarding their uptake of plasma inorganic phosphorus. The tissues of swine can be listed in the following order of decreasing phosphorus uptake rate.

Bile, Liver, Kidney, Thymus, Lymph node, Heart, Spleen, Tongue muscle, Lung, Stomach (smooth) muscle, Gastrocnemius and Biceps (skeletal) muscle, and Brain.

There is a considerable effect of age on the uptake of phosphorus by the tissues. Older animals have a slower rate of uptake (e.g., take longer to equilibrate with the plasma inorganic phosphate), but generally take up a greater portion of the administered dose. This is probably due to large quantities of phosphorus which are deposited in the bones of young animals.

¹ This work was supported by the U. S. Atomic Energy Commission.

² Postdoctoral Fellow of the Atomic Energy Commission; present address: Division of Poultry Husbandry, University of California, Davis, California.

³ The authors gratefully acknowledge the technical assistance of T. N. Chernikoff and Dean Ritter.

⁴ Division of Animal Husbandry, Davis, California.