Effect of level and particle size of insoluble non-starch polyscharids of rice hull and oat hull on performance, carcass characteristics and intestinal morphology of broiler chickens

To evaluate the effect of type (Rice Hull (RH) and Oat Hull (OH)), level (3 and 6 percent) and particle size (0.5 and 2 mm) of insoluble fiber on performance, carcass characteristics and intestinal morphology of chickens, 360 day-old male broilers (Ross 308), were use in a completely randomized design with 9 treatment and 4 replicate with 10 birds each, for 42 days. In the 29-42 days, broilers fed 6 percent with 0.5 mm RH had higher (P≤0.05) average daily gain, daily feed intake and lower feed: gain than control group. In fact, the 6 percent with 0.5 mm OH inclusion reduced (P≤0.01) abdominal fat and carcass performance as compared to control (P≤0.0`5). Results showed that broilers fed OH and RH had higher relative weight of gizzard and gallbladder than broilers fed the control diet (P≤0.05). Broilers fed RH had higher villus length than other treatment in the jejnum at 21 and 42 days of age and duodenum at 21 days of age (P≤0.01). In this experiment, the broiler fed 3 percent RH with 2 mm particle size had the highest epithelium width (P≤0.01) in the ileum section at 21 day of age. Therefore the results showed inclusion of 3 percent RH with 0.5 mm particle size to broiler diets may improve the growth performance and intestine morphology.