An experiment was conducted in order to investigate the effects of different levels of enzyme (control and 500 g/ton) and different levels of barley (0, 20 and 40% in ration) on broiler performance in a completely randomized design. Body weight and feed conversion ratio were measured weekly, and in the end of week 6, a hen and a rooster were slaughtered and the carcass percent and abdominal fat were measured. The result showed that for up to six weeks, the control ration caused better body gain besides the ration of the enzyme that has the same effect. Feed conversion ratio was the best in the ration that did not have barley (Control), while it was the worst in the ration that had 40% barley. It was observed that different levels of barley had no effect on carcass percent, but they had significant effect on abdominal fat; whereas different levels of enzyme resulted to increase in carcass percent, but they had no effect on abdominal fat.
Key words: Enzyme, barley, broiler, performance.
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