Dietary treatments consisted of a basal diet without any antimicrobial (Control), basal diet supplemented with 1.0 g/kg bacteriophage (B; 109pfu/g),basal diet supplemented with 3.0 g/kg fermented probiotic product (P) and basal diet supplemented with combination of1.0 g/kg bacteriophage and 3.0 g/kg fermented probiotic product (BP). Fermented probiotic products used herein containedL. acidophilus, B. subtilis and S. cerevisiae. Corn was replaced with bacteriophage (Exp. 1 and 2), probiotics and combination of bacteriophage and fermented probiotic product (Exp. 2) on an equal percentage basis. In both experiments, all diets met or exceeded the nutrient requirements as suggested by NRC (1998) and fed in meal form for 35 d (Tables 1 and 2).