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Related Effects of Copper, Molybdenum and Sulfide on Performance, Hematology and Copper stores of Growing Pigs^{1, 2,}

University of Kentucky, Lexington 40506

Abstract

Three experiments involving 208 growing pigs were conducted to evaluate the related effects of molybdenum and sulfide on performance, hematology and tissue copper stores.

In general, copper added at a level of 250 ppm tended to increase growth rate and decrease the amount of feed required per unit of gain as compared with controls, with little effect on hematological responses. Liver copper levels of pigs fed 250 ppm copper were slightly higher than those of controls. A 500 ppm level of copper supplementation resulted in depressed gains and feed/gain responses, reduced hemoglobin and hematocrit levels, and a marked accumulation of copper in the liver. The depressing effects of high dietary copper were partially overcome by the addition of sulfide, with no apparent response being attributed to molybdenum. A level of 450 to 900 ppm sulfide in the presence of 250 ppm copper and a level of 1,800 ppm sulfide in the presence of 500 ppm copper resulted in liver copper levels that were similar to those of pigs fed a low level (15 ppm) of copper.

¹ Journal Paper No. 73-5-10 of the University of Kentucky Agricultural Experiment Station, Department of Animal Sciences, Lexington 40506.

² This research was partially supported by a grant-in-aid from Phelps Dodge Refining Corporation, New York, N. Y. 10001

³ Present address: Haynes Milling Co., Portland, Indiana 47371.

⁴ Present address: ICA, Porcinos, Apartado Aereo 79-84, Bogota, Columbia, South America.