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Effects of Increasing Phytase Inclusion Levels on Broiler Performance, Nutrient Digestibility, and Bone Mineralization in Low-Phosphorus Diets

SUMMARY The objective of the current study was to evaluate the impact of increasing levels of phytase in corn-soy diets fed to male broilers. Experimental treatments included a positive control (PC) with a calculated non-phytate phosphorus (nPP) level of 0.43 and 0.39% for the starter and grower, respectively. The negative control (NC) diet included a reduction in nPP to 0.25 and 0.23% in the starter and grower, respectively, and phytase added to NC diet with increasing levels of 250, 500, 750, 1,000, 2,000, and 3,000/1,000 FTU/kg. All phytase treatments were fed throughout the study with the exception of the 3,000 FTU/kg treatment, which utilized a “step-down” program consisting of 3,000 FTU/kg in the starter being reduced to 1,000 FTU/kg in the grower. Treatment effects on performance, apparent metabolizable energy, apparent ileal digestibility of amino acids, phosphorus, and calcium, and bone mineralization were evaluated on days 14 and 28. The NC diet decreased feed consumption (FC) (P