The small intestine is a vital organ involved in absorption of nutrients and good intestinal health in broiler is the key factor to achieve desirable growth rates and feed conversion efficiency The integrity of gastrointestinal tract mucosa is of utmost important in production animals as it is the first tissue that comes in contact with ingested dietary ingredients Hence assessing the intestinal morphology grossly and microscopically can indicate response of the intestinal tract to active substances in feeds The result of current study showed that the length of the small intestine was not significantly affected by the dietary treatments however there was a numerical increase in length upon inclusion of PAB in diet The results on body weight gain and small intestine length also revealed that there is a relationship between length of intestine and body weight gained that longer the gut length more the time for digesta to pass through gut which leads to better nutrient absorption and resulted in a heavier body weight Supplementation of PAB at 400 g ton also resulted in decrease in weight of small intestine
