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Quadratic model of average daily gain (ADG) of growing pigs plotted against the ratio of fermented corn germ meal (FCGM) replacing soybean meal (SBM) in diet. The quadratic curve equation was: ADG = −0.3075 × (Ratio of FCGM replacing SBM)2 + 7.255 × (Ratio of FCGM replacing SBM) + 657.55, and the R2 was equal to 0.98. When the ratio of FCGM replacing SBM in diet was equal to 11.80%, the ADG (699.88 g/d) reached the highest point.
