Fig. 2

Frequency of diarrhea of enterotoxigenic E. coli F18 challenged pigs fed diets supplemented with probiotics. Frequency of diarrhea was calculated as the percentage of pig days with diarrhea score ≥ 3 or ≥ 4 in the total of pig days. ^a,bMeans without a common superscript are different (P < 0.05). Pigs in the PRO1 group had lower (P < 0.05) frequency of diarrhea throughout the experiment compared with pigs in the control group. Each least squares mean represents 8–10 observations. PRO1 = Bacillus subtilis DSM 32540; PRO2 = Bacillus pumilus DSM 32539