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Endogenous zinc excretion and 65Zn metabolism in Holstein calves fed intermediate to high but nontoxic zinc levels in practical diets


, : Endogenous zinc excretion and 65Zn metabolism in Holstein calves fed intermediate to high but nontoxic zinc levels in practical diets. Journal of Nutrition. 101: 12, 1673-1681

Zn and 65ZN metabolism, from a single intravenous dose, given 7 days after diets were started were studied in Holstein bull calves given a practical diet containing 38 mg Zn/kg or the same diet with 200 or 600 mg supplemental Zn/kg as zinc oxide. The supplemental Zn increased endogenous 65ZN in faeces by 30%, 200 mg Zn/kg having as much influence as 600 mg/kg. The supplemental Zn had a variable effect on 65Zn distribution in different tissues 14 days after dosing. With some tissues including testicle, rumen wall and abomasum (fundic) each increase in Zn in the diet reduced65Zn content. In muscle, amount of Zn in the diet had no effect of 66Zn concentration. Added Zn 200 mg/kg increased 65Zn and stable Zn in pancreas, liver and kidney; a further increase to 638 mg/kg caused large increases in these tissues indicating a breakdown in homoiostatic control for both injected and absorbed Zn. With 638 mg/kg smaller increases in 65Zn occurred in bone and small intestine. Serum 65Zn increased with the high-Zn diet. Except for muscle, where there was no change, specific activity in every tissue studied decreased with each increase in Zn in the diet.

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PMID: 5126263


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