Addition of the recommended level of phytase (1X) to the basal diet (nPP = 0.15%) significantly (P <0.05) improved BW, feed intake, FCR, mortality, and toe and tibia ash percentage. However, supplementation of the basal diet with incremental dosages of phytase (up to 4X) further increased BW, feed intake, toe, and especially percentage of tibia ash. The mortalityrate and feed conversion ratio was not significantly (P > 0.05) influenced by increasing the dose of phytase beyond that of the current recommendation (1X).
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