Dicalcium Phosphate and Phosphoric Acid as Phosphorus Sources for Beef Cattle

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

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