Absorption, Retention and Tissue Deposition of Labeled Inorganic Phosphates by Cattle

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Abstract
Phosphorus−32 in three inorganic phosphatic compounds was administered orally to calves and steers in order to compare absorption, retention, and tissue deposition of phosphorus from the different sources. P32 in reagent grade dicalcium phosphate was absorbed and retained in larger amounts than that in defluorinated rock phosphate or soft phosphate. Apparent absorption values for reagent grade dicalcium phosphate, defluorinated rock phosphate and soft phosphate were 70.0, 61.2 and 53.5%, respectively. Retention values were: dicalcium phosphate, 67.6; defluorinated rock phosphate, 47.7 and soft phosphate 45.8%. The major portion of P32 administered intravenously was excreted in the feces. Copyright © 1963. American Society of Animal Science . Copyright 1963 by American Society of Animal Science