The improved growth performance observed by dietary supplementation of Bacillus-based probiotic, especially during the grower period, might be associated at least in part with the improvement in fat digestibility elicited by the probiotic duringthe same period. Lee et al. (2014) reported improvement in ATTD of DM, GE and CP in pigs offered diets supplemented with B. subtilis fermentation biomass. Choi et al. (2011) reported that weanling pigs fed diets supplemented with multi-microbe probiotic products containing B. subtilis had improved ATTD of DM and GE. Kunavue and Lien (2012) also reported that supplementation with probiotic containing L. acidophilus, B. lactis, B. subtilis and B. natto to growing pig diets significantly increased energy, phosphorus and ash digestibility.