During the same period, pig offered the standard energy diet exhibited a significantly (P = 0.003)better F:G than those offered the lower energy diet. For the overall post-weaning period (28-70 d.), supplementation with the Bacillus-based probiotic improved growth by 6.1% (P=0.0030). Piglets on the standard energy diet exhibited improved F:G ratio compared to piglets receiving the lower energy diet (P=0.0020).