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Availability of Phosphorus in Dicalcium Phosphates and Defluorinated Phosphate for Steers¹

Purdue University, Lafayette, Indiana

Abstract

Six phosphorus balance experiments were conducted with beef steers to determine the availability of phosphorus from defluorinated phosphate, feed grade dicalcium phosphate and dicalcium phosphate (U.S.P.).

Dicalcium phosphate (U.S.P.), when compared with defluorinated phosphate, showed significantly higher apparent digestibility values in only one experiment. However, when results from experiments I through IV were combined for statistical comparison, dicalcium phosphate (U.S.P.) had a significantly higher percent apparent digestibility. The difference 5 in "true" digestibility was not significant. Nonsignificant increases in serum inorganic phosphorus levels were also recorded for steers fed dicalciutn phosphate (U.S.P.).

The two sources of dicalcium phosphate were of equal availability, when compared on the basis of apparent and "true" digestibility and change in serum phosphorus.

¹ Journal Paper No. 2460, Purdue University Agricultural Experiment Station.

² The authors are indebted to Hooker Chemical Corporation, Jeffersonville, Indiana, for supplying the feed grade dicalcium and defluorinated phosphates and for providing funds for this study.