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The ADG of nursery pigs fed diets with the level of SPC replacing animal protein supplements in overall. Based on an exponential model, the 95% maximum response was obtained at 10.5% animal protein supplements replaced by SPC; The equation is: ADG (g/d) = 506.4 − 36.82 * (1 + e (0.0146 * x)) (P < 0.05).
