J. Anim Sci.
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J. Anim Sci. 1984. 58:356-361.
© 1984 American Society of Animal Science
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Interactive Effects of Dietary Calcium, Phosphorus and Copper on Performance and Liver Stores of Pigs1,2,

T. J. Prince3, V. W. Hays and G. L. Cromwell

University of Kentucky, Lexington 40546-0215

Abstract

Three experiments involving 304 pigs were conducted to determine the related effects of copper (Cu), calcium (Ca) and phosphorus (P) on the performance and liver Cu stores of growing finishing pigs. Rate and efficiency of gain were improved by the addition of 250 ppm of Cu to the diets. Improvements in rate of gain averaged 6.6% (652 vs 696 g/d) to 60.5 kg body weight and 1.7% (713 vs 725 g/d) to 94.5 kg body weight. Feed:gain ratio was improved by 1.4% to 60.5 kg and 1.6% to 94.5 kg body weight when Cu was added to the diet. Increasing the dietary Ca and P levels from .65% Ca and .55% P to 1.2% Ca and .86 or 1.0% P resulted in increased (P<.01) growth rate to 60 and 95 kg (649 vs 699 g/d and 700 vs 737 g/d, respectively), but feed efficiency was not affected (2.86 vs 2.84 and 3.18 vs 3.17 kg feed/kg gain, respectively.) Feeding the higher Ca and P levels resulted in increased liver Cu levels in pigs fed 250 ppm Cu (189 vs 323 ppm), but Ca and P did not affect liver Cu of pigs fed low Cu diets (29 vs 28 ppm). When dietary Ca and P were varied independently, the high Ca level increased liver Cu, but P had little effect on liver Cu. Increasing the dietary P level partially alleviated the effect of Ca on liver Cu.

Footnotes

1 Journal Paper No. 83-5-37 of the Kentucky Agr. Exp. Sta., Dept. of Anim. Sci.

2 This research was supported in part by a grant-in-aid from Phelps Dodge Refining Corp., New York 10022.

3 Current Address: Anim. and Dairy Sci. Dept., Auburn Univ., Auburn, AL 36849.






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Copyright © 1984 by the American Society of Animal Science.