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Utilization of Calcium and Phosphorus from Hydrous and Anhydrous Dicalcium Phosphates¹

Departments of Biochemistry and Animal Science, Purdue University, West Lafayette, Indiana

Studies were conducted with chickens and turkeys to determine factors which affect the nutritional availability of phosphorus from dicalcium phosphates. Incorporation of orally administered ⁴⁵Ca and ³²P from either ⁴⁵CaH³²PO₄ or ⁴⁵CaH³²PO₄·2H₂O into bone was 25 to 50% greater from the hydrous form than from the anhydrous form in 1-week-old birds. For chickens the differences in incorporation of ⁴⁵Ca and ³²P from anhydrous and hydrous dicalcium phosphate decreased gradually, so that at 5 weeks of age, equal amounts of ⁴⁵Ca and ³²P were incorporated into the femur when chicks were fed either form of the phosphate. In turkeys, the incorporation of ⁴⁵Ca and ³²P was greater when supplied in the hydrous form than in the anhydrous form throughout the 5-week experimental period. Further studies were conducted with 1-week-old chicks and turkeys fed controlled amounts of feed and killed at 1, 2 and 4 hours after oral dosing. Incorporation of ⁴⁵Ca and ³²P into the femur from anhydrous dicalcium phosphate was again less at each time interval than incorporation from hydrous dicalcium phosphate. Measurement of the rate of solution for CaHPO₄·2H₂O at pH 3 to 7 indicated that the differences in incorporation may be due in part to differences in solution rates. The solution rate and the amounts of ⁴⁵Ca and ³²P incorporated into the bone were both higher with hydrous dicalcium phosphate.

Manuscript received 11 May 1968.