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Utilization of Phytin Phosphorus by Sheep

University of Tennessee—Atomic Energy Commission Agricultural Research Laboratory, Oak Ridge, Tenn.^,3,4,

Abstract

Twelve wether sheep approximately 18 months old and weighing approximately 90 lb. each were used to compare, as phosphorus sources, calcium phytate and monocalcium phosphate. Both phosphorus supplements supplied 70% of the phosphorus in rations supplying 2.38 gm. of phosphorus per 100 lb. of liveweight. Criteria of response were apparent digestibilities, net retention, fecal endogenous excretions, and true digestibilities of dietary calcium and phosphorus. Treatment differences in all criteria were small and statistically insignificant, indicating the availabilities of both calcium and phosphorus contained in calcium phytate were in the same order of magnitude as those supplied by monocalcium phosphate. Methodology as applied to radioisotope procedures for measuring fecal endogenous excretion of calcium and phosphorus was discussed.

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

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

³ Published with the approval of the Director, Tennessee Agr. Exp. Station, Knoxville. The authors gratefully acknowledge the technical assistance of W. A. Lyke, B. Richmond and G. Tapps in the chemical and radio-chemical analyses. The assistance and advice of S. L. Hansard are also acknowledged and appreciated.

⁴ The radioactive materials were obtained from the Oak Ridge National Laboratory on allocation from the United States 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.