Studies on the Requirements of Young Poults for Available Phosphorus

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Abstract
Experiments on availability of phosphorus for young poults showed that the phosphorus in reagent grade anhydrous dicalcium phosphate (CaHPO4) is relatively unavailable as compared with that in hydrated dicalcium phosphate (CaHPO4·2H2O) or in commercial dicalcium phosphate. The results indicated either (1) that the availability of the phosphorus in commercial soybean meal is much higher than previously suspected, or (2) that soybean meal contains some unknown factor which enhances the availability of the phosphorus in reagent grade anhydrous dicalcium phosphate. Even in a diet containing intact soybean meal as the source of protein, there were marked differences in the availability to young poults of the phosphorus in various inorganic feed phosphates.