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Related Effects of Copper, Zinc and Iron on Performance, Hematology and Copper Stores of Pigs¹

University of Kentucky, Lexington 40506

Abstract

Contradictory reports exist in the literature regarding the related effects of copper, zinc and iron on performance and copper stores of pigs. Increasing the dietary level of zinc above that found in normal diets has been shown to decrease the amount of copper stored in the livers of pigs (Allen et al., 1958; O'Hara, Newman and Jackson, 1960; Hanrahan and O'Grady, 1968). However, other workers have not been able to reduce the copper stores of rats and pigs by increasing dietary zinc (Kulwich et al., 1953; Cox and Hale, 1962; Kinnamon, 1966; Gipp, Pond and Smith, 1967).

Suttle and Mills (1966) found that supplemental iron prevented hemoglobin levels from declining in pigs fed diets high in copper. Also, high dietary levels of iron have been shown to reduce liver copper stores in the pig fed excess copper (Kainski et al., 1967). There does not seem to be a single explanation for the varied responses in copper status of pigs to additional zinc and iron supplementations.

¹ Journal Paper No. 71-5-102 of the University of Kentucky Agricultural Experiment Station, Department of Animal Sciences.

² This research was partially supported by a grant-in-aid from Phelps Dodge Refining Corporation, New York, N. Y.