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Ruminant Utilization of Sodium Meta-, Ortho- and Pyrophosphates

University of Tennessee—Atomic Energy Commission Agricultural Research Laboratory, Oak Ridge^{,3, 4, 5,}

Abstract

Eighteen wether sheep approximately 13 months old and weighing 90–100 lb. were used to determine the availability of phosphorus supplied as vitreous sodium metaphosphate and acid sodium pyrophosphate; monosodium phosphate was used as the control. All phosphorus supplements supplied 66.1% of the phosphorus in rations supplying 2.0 gm. of phosphorus per 100 lb. of liveweight. Criteria of response were apparent digestibilities, net retentions, fecal endogenous excretions and true digestibilities of phosphorus. Acid sodium pyrophosphate was equally as available as monosodium phosphate. Vitreous sodium metaphosphate caused increased fecal phosphorus excretion; but, as this could be accounted for by increased endogenous phosphorus, the true digestibilities of the three phosphates were not different. The data indicate that although the phosphorus of vitreous sodium metaphosphate was absorbed, it was inefficiently utilized.

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

² Present address, Kansas Agricultural Experiment Station, Hays.

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

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.

⁵ The technical assistance of W. A. Lyke, B. Richmond and G. Tapp is acknowledged and sincerely appreciated.