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Fitted BLL regression model for bone percentage ash as a function of increasing STTD P in 24- to 130-kg pigs. The BLL model estimated the maximum mean percentage ash at 131% (95% CI: [113, 148%]) of the NRC (2012) recommendations within phases. Based on the best fitting model, the estimated regression equation was bone ash, % = 62.1000 – 2.5374 × (1.31 – STTD P as % of NRC) if STTD P as % of NRC <1.31%, and bone ash, % = 62.100 if STTD P as % of NRC ≥1.31%.
