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Inorganic Phosphorus Utilization by Swine as Measured by an Isotope Technique¹

Department of Animal Science Florida Agricultural Experiment Station, Gainesville

Abstract

Twenty-five weanling pigs receiving a corn-soy-tankage ration were given a single oral dose of radioactive phosphorus in the form of chloroapatite, "FeA1P04," defluorinated rock phosphate, reagent-grade dicalcium phosphate or soft phosphate. Total fecal and urinary collections were made for 144 hours following isotope administration, after which the pigs were sacrificed and a femur removed for measurement of P³² uptake. The urine radioactivity reached its peak most frequently within the first 12 hours after dosing and always preceded the peak fecal activity by at least 12 hours. The major portion of P³² eliminated by way of the gut was excreted within 72 hours after dosing; however, fecal P³² was more directly related to dry matter excretion than to time after dosing. The defluorinated phosphate and dicalcium phosphate had comparable "net retention" values of 29.7 and 29.9%, respectively, while the "net retention" of P³² from soft phosphate was 20.1%. Limited data for chloroapatite and "FeAlP04" indicated "net retention" values of 31.0 and 6.7%, respectively. The levels of P³² present in the femur were generally proportional to the percent of P³² absorbed.

¹ Florida Agricultural Experiment Stations, Journal Series No. 1589.

² Present address: Department of Animal Husbandry, Iowa State University, Allies, Iowa.

³ The authors wish to acknowledge the Soft Phosphate Research Institute, Ocala, Fla. and the Smith-Douglass Company, Norfolk, Va. for funds in support of this study and the technical assistance of M. C. Jayaswal, J. C. Sung and J. E. Wing.