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Effects of Level of Dietary Copper, Molybdenum, Sulfate and Zinc on Bodyweight Gain, Hemoglobin and Liver Copper Storage of Growing Pigs¹

Cornell University, Ithaca, New York

Abstract

Seventy-two Yorkshire pigs were placed on 12 dietary treatments from weaning to market weight (90 kg.) to determine the effect of molybdenum, sulfate and zinc, on the average daily gain, blood hemoglobin and liver copper storage of pigs fed a high level of copper. No significant gain response was obtained from feeding supplemental copper, molybdenum, sulfate, or zinc, although pigs in all treatments tended to gain slower than the controls. Molybdenum and sulfate fed together tended to prevent this reduction in rate of gain. Liver copper storage was doubled by feeding supplemental copper, but was unaffected by high levels of molybdenum, sulfate, or zinc. Blood hemoglobin levels were not affected by any of the treatments. There was no conclusive evidence to support any copper-molybdenum-sulfate interrelationship or any copper-zinc interaction.

¹ The authors gratefully acknowledge Phyllis Chapman and Earl F. Walker, Jr. for assistance with analysis, and John Dunn and George Kiger for care of animals.