were fed 4 diets (5 pens per treatment) for 2 wk: a control diet (without fermented soybean meal but with 25% dried skim milk) and 3 diets with 3, 6, and 9% fermented soybean meal replacing dried skim milk based on crude protein. Concentrations of crude protein, Lysine, Methionine, Threonine, and Tryptophan were kept consistent among diets in Exp. 1 and 2