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Dicalcium Phosphate and Phosphoric Acid as Phosphorus Sources for Beef Cattle

University of Tennessee—Atomic Energy Commission Agricultural Research Laboratory^,3,4,

Abstract

Twelve one year old grade Hereford steers weighing approximately 500 lb. each, were used to compare, as phosphorus sources, reagent grade phosphoric acid and dicalcium phosphate. Both phosphorus supplements furnished 60.2% of the phosphorus in rations supplying 2.0 gm. of phosphorus per 100 lb. of liveweight; 39.8% of the phosphorus being supplied by ration ingredients. Criteria were apparent digestibility, net retention, fecal endogenous excretion and true digestibility of phosphorus supplied by the supplements. Treatment differences in all criteria were small and statistically insignificant, indicating the availability of phosphorus supplied by phosphoric acid to be in the same order of magnitude as that supplied by dicalcium phosphate.

¹ Research participant, Oak Ridge Institute of Nuclear Studies. On leave of absence from Oklahoma State University, Stillwater.

² Present address: Kansas Agr. Exp. Station, Hays.

³ Published with the approval of the Director, Tennessee Agricultural Experiment Station, Knoxville.

⁴ The radiophosphorus was obtained from the Oak Ridge National Laboratories on allocation from the U. S. Atomic Energy Commission. This study was completed under contract No. AT-40-1-Gen-242 between the University of Tennessee and the Atomic Energy Commission.

The authors gratefully acknowledge the technical assistance of W. A. Lype, B. Richmond and G. Tapps, who aided with the chemical and radiochemical analyses.