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Phytase is an enzyme that breaks down phytate‚ liberating inorganic phosphorus¸ Although phytase occurs naturally in soybean‚ it is not synthesized until after seed germination¸ Extracellular phytase overproduced by the fungus Aspergillus niger has been used as a dietary supplement in place of inorganic phosphorus¸ Simons et al¸ (1990) found that phytase addition to poultry diets significantly improved growth rate and increased phosphorus utilization by 60%¸ Edwards (1993) reported that the supplementation of phytase to broiler diets decreased fecal phytase­bound phosphorus by 69 to 79%¸ Although phytase supplementation effectively improves nutritional quality while decreasing waste‚ the high cost of phytase enzyme preparations currently limits commercial use¸