The reduced fecal Mn excretion and greater absorption,retention, and ATTD of Mn for pigs fed the corn–SBM diet supplemented with Mn(HMTBa)2 compared with pigs fed the corn–SBM diet supplemented with MnSO4 are consistent with previous data (Creech et al.,2004). However, these differences were not observed in the corn grits diets, which indicates that the reason for the difference in ATTD of Mn in the corn–SBM diet may be that MnSO4 binds more easily than Mn(HMTBa)2 to phytic acid, which results in a reduced digestibility. Supplementation of Mn(HMTBa)2 reduces the formation of complex between Mn and phytic acid and, therefore, reduces the negative effects of phytic acid on the ATTD of Mn (Kies et al., 2005, 2006).