The relative biological availability of phosphorus in feed phosphates for broilers

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Abstract
The relative biological values (R.B.V.) of the following feed phosphates were investigated: 2 monocalciumphosphates (MCP), 2 hydrated dicalcium phosphates (DCP), 2 anhydrous dicalciumphosphates (AnDCP), 2 defluorinated rock phosphates (DFP), Ca-Mg-Na-phosphate (CMP), 1 mono-Na-phosphate (MSP), 1 di-Na-phosphate (DSP) (= reference P-source), a meat-and-bone meal (MBM) and a Ca-Al-Fe-phosphate (CAP). Two successive experiments were carried out; an increasing Ca: P-ratio (Ie experiment) or a constant Ca-level (2e experiment). The effect of the Na:Cl ratio upon the R.B.V. also received attention. The features of the tibia (breaking strength, ash content, ash percentage and P content) were only considered to calculate the R.B.V. The broilers were kept in cages, under normal environmental circumstances (deionized water). The P deficient experimental rations were equally fed to all the uniform test groups during a period of intense mineral anabolism (7-20 days). The results of both experiments were very similar (I-8%). Averaged for the 2 experiments, the following R.B.V. were found in comparison to DSP (= 100): MCP .noteq. (source A) = 98, MCP .noteq. B = 93, DCP .noteq. A = 101, DCP .noteq. B = 92, An DCP .noteq. A = 86, An DCP .noteq. B = 86, DFP .noteq. A = 96, DFP .noteq. B = 95, CMP = 102, MSP = 96, MBM = 90 and CAP = 15%. Clear differences in ammonium citrate-(2%) solubility do not correlate with analogous R.B.V. differences. The P utilization (retention) was markedly favored by an increasing Na:Cl ratio in the feed, combined with a metabolizable anion.

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