Influence of Dietary Calcium and Zinc on Calcium-45, Phosphorus-32 and Zinc-65 Metabolism in Swine

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Abstract
Radiotracer techniques were utilized in a 2 × 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.

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