Soy protein concentrate is mainly used in diets fed to young pigs and calves because
of their immature digestive tract and sensitivity to antigenic factors in SBM (Dawson et
al., 1988; Sohn et al., 1994). Glycinin and β-conglycinin in SBM are the antigenic factors
that cause the immune stimulation in pigs (Li et al., 1990). The absence of
oligosaccharides, the reduced concentration of trypsin inhibitors, and the reduced
concentration of antigenic factors in SPC make young pigs tolerate SPC better than SBM
resulting in improved performance (Sohn et al., 1994).