Similarity index of DGGE profiles obtained from feces of 12 piglets. Symbol: Control (No.1-4), piglets on control diet with
antibiotic; BVAI (No.5-8) or BVAII (No.9-12), piglets on diets containing 0.4% BV and 0.25% acidifier I or II, respectively. In terms of
similarity index, the bacterial communities of piglets fed with BV and acidifier in BVAI (No. 5-8) and BVAII (No.9-12) treatment clustered
together forming a cluster designated by us as Cluster C and separated from another cluster in piglets (No.1-3) fed antibiotic designated as
Clusters A in the Control treatment, with the exception of piglet (No.4).