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Effects of Copper, Molybdenum and Sulfate on Performance, Hematology and Copper Stores of Pigs and Lambs ^{1, 2,}

University of Kentucky, Lexington 40506

Abstract

Braude (1965) summarized results of a large number of experiments and concluded that pigs fed a high level of copper (250 ppm) gained an average of 8.1% faster and required 5.4% less feed per unit of gain than pigs fed diets containing adequate copper to meet the estimated nutritional requirement. This level of copper increases the copper stores in the liver and the growth response often disappears after pigs reach 50 to 60 kg body weight.

In ruminants, molybdenum and sulfate are effective in counteracting copper toxicity. Dick (1953, 1954a, 1956) and Wynne and McClymont (1955) demonstrated that liver copper stores of sheep could be reduced by feeding adequate molybdenum and sulfate. Results of limited research with rats (Comar, Singer and Davis, 1949) and pigs (Kulwich et al., 1953; Gipp, Pond and Smith, 1967) would suggest that, in contrast to ruminants, the response of nonruminants to copper is less dependent on the molybdenum and sulfate contents of the diet.

^₁ Journal Paper No. 7-5-167 of the University of Kentucky Agricultural Experiment Station, Department of Animal Sciences, Lexington 40506.

² Appreciation is extended to D. D. Kratzer for assistance in analyzing the data.

³ Present address: Department of Animal Sciences, Iowa State University, Ames 50010.

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