J. Anim Sci.
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J. Anim Sci. 1963. 22:658-661.
© 1963 American Society of Animal Science
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Effect of Calcium and Phosphorus Levels on Baby Pig Performance1

D. R. Zimmerman2, V. C. Speer, V. W. Hays and D. V. Catron3,4,

Iowa Agricultural and Home Economics Experiment Station, Ames5

Abstract

A series of experiments was conducted to determine the optimum Ca and P levels in high-milk-product rations for maximum body weight gain, efficiency of feed utilization and metatarsal calcification of swine 2 to 7 weeks of age.

Low P levels and high Ca levels in the rations slowed the rate of body weight gain. In general Ca:P ratios of 1.6:1.0 or wider adversely influenced gains. Ca and P appeared to independently influence the efficiency of feed utilization. High Ca levels in the ration (above 0.8%) reduced the efficiency, while P up to approximately 0.6% of the ration improved the efficiency of feed utilization. The highest levels of Ca (1.0%) and P (0.7%) in the ration produced the maximum responses in metatarsal calcification; however, the largest increments of response came between the lower levels, especially with regard to P. The results of these experiments suggest a maximum Ca level of 0.8% and a minimum P level of 0.6% to assure maximum performance and adequate skeletal development. Although high Ca levels in the ration lowered serum chlortetracycline values, it was demonstrated that this was not the cause of the adverse effect of high Ca intakes on body weight gains.

Footnotes

1 Journal Paper No. J-4202 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 959.

2 Present address: Lobund, Department of Biology, University of Notre Dame, Notre Dame, Indiana.

3 Present address: Walnut Grove Products Ca., Atlantic, Iowa.

4 The authors gratefully acknowledge the assistance of Calcium Carbonate Company, Quincy, Illinois, in analyzing some of the rations for calcium and phosphorus.

5 Department of Animal Science.






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