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The G:F 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 16.8% animal protein supplements replaced by SPC; The equation is: y (G:F) = 0.736 − 0.006 * (1 + e (0.0238 * x)) (P < 0.05).
