Abstract
Commercial microbial phytase (Natuphos®5000, 1000 units/kg) was fed to turkey hens grown to market age as a partial substitute for inorganic phosphate in corn-soybean meal diets. Available P (aP) levels followed NRC recommendations or were reduced by 0.15%. Dietary Ca levels remained at levels recommended by NRC. This process revealed that phytase improved feed intake and body weight gains of turkey hens grown to market age. Partial substitution of phytase for inorganic P did not influence body composition, toe ash, or bone breaking strength. Partial substitution of phytase for aP did not result in increased P retention from commercial corn-soybean meal diets. Results suggest that too high a P concentration, too wide a Ca:P ratio, or both prevented Natuphos® phytase from increasing P digestibility under commercial type conditions employed in this study.
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