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Influence of Dietary Calcium and Zinc on Calcium-45, Phosphorus-32 and Zinc-65 Metabolism in Swine^{1, 2,}

University of Tennessee-Atomic Energy Commission Agricultural Research Laboratory Oak Ridge, Tennessee and and Kentucky Agricultural Experiment Station Lexington, Kentucky

Abstract

Radiotracer techniques were utilized in a 2 x 2 factorial experiment, replicated, involving 32 barrows (average weight 46 lb.), to study the calcium and zinc interrelationship in swine.

Calcium added to a low zinc ration (29 ppm), decreased blood, plasma and total tissue Zn⁶⁵ levels. However, calcium added to a, zinc supplemented ration (100 ppm) increased blood and total tissue Zn⁶⁵ activity. Increased dietary calcium lowered blood and plasma Ca⁴⁵ activity, and increased stable calcium retention. Supplemental calcium depressed plasma P³² levels and urinary P³² excretion.

Increased dietary zinc decreased retention of Zn⁶⁵ in blood, plasma, lung, heart, spleen, kidney, pancreas, small intestinal wall, muscle, and skin. Supplemental zinc exerted no significant effect on Ca⁴⁵ blood or plasma activity but increased blood P³² levels. Variation of dietary zinc and calcium did not influence weight gains, and no parakeratosis was observed.

¹ The investigation reported in this paper is published with approval of the directors of the Kentucky Agricultural Experiment Station and the Tennessee Agricultural Experiment Station.

² The radioisotopes used in this work were obtained from Oak Ridge National Laboratory on allocation from the United States Atomic Energy Commission. This work was completed under Contract No. AT-40-1-GEN-242 between the University of Tennessee College of Agriculture and the Atomic Energy Commission.

³ University of Kentucky graduate research participant at University of Tennessee-Atomic Energy Commission Agricultural Research Laboratory.