Improving Phytate Phosphorus Availability in Corn and Soybean Meal for Broilers Using Microbial Phytase and Calculation of Phosphorus Equivalency Values for Phytase

• DOI: 10.3382/ps.0750240
• Publication Date: 2012-04-21T22:32:19Z
• Authors: Z. YI; E.T. KORNEGAY; V. RAVINDRAN; D.M. DENBOW
• Keywords: Phytase; Amen

Two experiments were conducted to determine the effectiveness of Natuphos phytase for improving P availability soybean meal-based semipurified diets (SP, Experiments 1 and 2) corn-soybean (CS, Experiment fed broilers (1 21 d). There 360 288 birds SP in 2, respectively, CS 2. Phosphorus equivalency values calculated. The basal formulated contain 0.27% nonphytate (nP); diet contained 0.45% total (tP) that included 0.17% as defluorinated phosphate; 0.51% tP 0.12% phosphate. Both supplemented with phosphate provide 0.36, 0.45, 0.54% nP or 350, 700, 1,050 U phytase/kg diets. Supplementing linearly increased BW gain (P < 0.001), feed intake percentage ash dried toes 0.01). Phytase addition apparent retention 0.02), Ca 0.005 2), N <0.06 2 CS), digestibility DM 0.04), decreased <0.005) excretion. In comparison np diet, excretion was reduced 42 51% by phytase. 0.02) 0.007). average released calculated solving nonlinear linear response equations levels gave a value g = 1,146 only 785 These studies show microbial is effective decreasing Added can also increase retention.