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Fitted broken-line linear ascending model (BLL) for estimation of optimal dose of phytase on STTD of Ca in growing pigs fed corn-SBM diet. The BLL model estimated the maximum STTD of Ca at 526 phytase units (FTU)/kg diet (95% CI: [366, 686 FTU/kg]). The estimated equations were: STTD of Ca, % = 88.57 − 0.039 × (526 − phytase), if phytase < 526 FTU/kg; STTD of Ca = 88.57%, if phytase ≥ 526 FTU/kg.
