This investigation was conducted to study the influence of separating and regrinding the large particle size of barley as compared to the barley ground coarse feds on improving overall broiler performance and possible change associated with morphology in the digestive system. Thirty chicken were used in the experiment. They were brooded for 21 days and thereafter divided into two groups of treatment. The two diet treatments were coded for particle size, ground barley diet GBD (control), and

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... ound coarse-fraction barley diet (RBD). Each treatment was applied on 15 birds. The experimental period was 21 days (from day 21 to 42 day old). The performance of the broilers was monitored on daily basis. At the end of week six, all birds in each treatment were slaughtered via neck slit, defeathered and eviscerated for carcass and intestinal moropholgy analysis (i.e., relative length of digestive). The results showed that RBD reduced feed intake and improved feed conversion ratio and changed gastrointestinal morphology of broilers during the growing stage. From the processing prospective, regrinding coarse fraction reduced average particle size without producing excess of fines. Regrinding coarse particles of barley could be also an approach to reduce production cost of broiler feed through minimizing feed intake without producing excess of fines.