J. Anim Sci.
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J. Anim Sci. 1962. 21:112-118.
© 1962 American Society of Animal Science
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Calcium and Phosphorus Requirements of Growing-Finishing Swine1

H. L. Chapman, Jr.2, J. Kastelic3, G. C. Ashton4, P. G. Homeyer5, C. Y. Roberts6, D. V. Catron7, V. W. Hays and V. C. Speer8

Iowa Agricultural and Home Economics Experiment Station,9, Ames

Abstract

Calcium and phosphorus requirements of growing-finishing swine fed rations fortified with vitamins, trace minerals, and an antibiotic, were investigated employing a partial 6 x 7 factorial plan, with dietary levels of calcium and phosphorus ranging from 0.2 through 0.8 and 0.2 through 0.7%, respectively.

Multiple regression analysis involving the averages of four pigs per treatment within weight groups revealed 67 to 76%, 76 to 93% and 75 to 88% of the variability in average daily gain, breaking strength of femurs, and femur ash content, respectively, was attributable to the variation of calcium and phosphorus in the ration. Phosphorus had a greater influence on the response criteria than did calcium. The calcium-phosphorus ratio was more important when minimal dietary levels of phosphorus were fed.

Flame spectrophotometric analysis revealed no significant difference in calcium, potassium, sodium or magnesium content of femur ash in two trials examined. There was no statistically significant change in the phosphorus content of the femur ash due to ration treatment. As the dietary phosphorus level increased, there was a significant increase in both femur weight and femur fat content.

The dietary requirements to assure maximum rate of gain and optimum skeletal development appears to be 0.8% calcium and 0.6% phosphorus, for the pig from 25 lb. to 100 lb., and 0.7% calcium and 0.5% phosphorus from 25 lb. to 200 lb.

Footnotes

1 Journal Paper No. J-4006 of the Iowa Agricultural and Home Economics Experiment Station, Ames. Projects 930 and 1239.

2 Present address: Everglades Experiment Station, Belle Glade, Florida.

3 Present address: Department of Animal Science, University of Illinois, Urbana.

4 Present address: Department of Physics, Ontario Agricultural College, Guelph, Canada.

5 Present address: General Analysis Corporation, Los Angeles 25, California.

6 Present address: Yoder Feed Mills, Inc., Kalona, Iowa.

7 Present address: Walnut Grove Products Company, Atlantic, Iowa.

8 The authors gratefully acknowledge the assistance of M. A. Emmerson, Department of Veterinary Obstetrics and Radiology; E. A. Kline, Meats Laboratory; Miss Helen Maddock, American Cyanamid Company, New York, New York; and Don Quinn and associates at the Swine Nutrition Research Farm in conducting the experiments. The authors also acknowledge support by grants-in-aid from Darling and Company, Chicago, Illinois, and Shea Chemical Corporation, Baltimore, Maryland.

9 Dept. of Animal Husbandry.






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Copyright © 1962 by the American Society of Animal Science.