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Weight Gain, Feed Utilization and Bone and Liver Mineral Composition of Pigs Fed High or Normal Ca-P Diets from Weaning to Slaughter Weight

Cornell University, Ithaca, N. Y. 14853^{1, 2,}

Abstract

One hundred and twenty mycoplasma pneumonia-free Yorkshire weanling pigs were divided randomly at 4 to 6 weeks of age into two groups fed a high (1.2% Ca, 1.0% P) Ca-P or normal (.5% Ca., .4% P) Ca-P corn-soybean meal-type diet to slaughter at approximately 90 kg live weight to determine the effect of dietary Ca-P level on weight gain, feed utilization and mineral content of bone and liver. There was no significant effect of Ca-P level on weight gain, efficiency of feed utilization or on retention of Ca, Co, Cu, Mg, Mn or Zn in bone or liver. Fe content of radius-ulna was decreased (P<.05) by high Ca. Ash content of radius-ulna from pigs fed 1.2% Ca-1,0% P tended to be higher than that of radius-ulna from pigs fed .5% Ca-.4% P. The lack of change in bone and liver concentrations of Mg, Co, Cu, Mn or Zn of pigs fed high Ca-P diets suggests that major changes in body stores of required trace elements are not likely as a result of high-Ca-P feeding if dietary levels are at or above N.R.C. recommendations.

¹ Department of Animal Science.

² The authors are indebted to R. G. Eggert, American Cyanamid Co., Princeton, New Jersey for supplying the antibiotic supplement and to Priscilla Lawrence, Allan Chandler and Charles Avery for technical assistance and care of animals.