However, there was no effect of antibiotics on the numbers of bifidobacteria in the cecum or colon. In jejunum, lactobacilli counts were higher (p=0.004) for pigs fed olaquindox and zinc bacitracin than for pigs fed acetylspiramycin or the control diet. However, lactobacilli were lower in the cecum for pigs fed acetylspiramycin than for pigs fed zinc bacitracin.
Lactobacilli counts were unaffected by antibiotic treatments in ileum, colon and rectum.