Effects of bay leaves (1%, 2%, and 3%) towards the population of colonic bacteria in vivo rat models from 0‐h, 24‐h, and 7‐days. (a) indicates the evaluated numbers of sulfate‐reducing bacteria (SRB) while (b–d) indicts the Bifidobacteria group, Clostridium histolyticum group, and Lactobacillus‐Enterococcus numbers, respectively. Control (−ve): Healthy normal rats fed with basal diet without bay leaves; control (+ve): UC rats fed with basal diets without any bay leaves; 1% Bay leaves: UC model fed with a basal diet supplemented with 1% bay leaves; 2% Bay leaves: UC model fed with a basal diet supplemented with 2% bay leaves; 3% Bay leaves: UC model fed with a basal diet supplemented with 3% bay leaves.