This experiment was conducted to investigate the effects of using three commercial enzymes on performance
and carcass quality of broiler chickens fed with wheat-barley-soy based diets. In a completely randomized design
405 of broiler (Ross308) in nine treatments, three replicates (with 15 bird in each replicate) were used. The
experimental diets included 1) diet based on corn–soybean meal (with no enzyme), 2) diet based on wheat–
soybean meal (with no enzyme), 3) diet based on wheat–soybean meal (with safizim), 4) diet based on wheat–
soybean meal (with kombo), 5) diet based on wheat–soybean meal (with kemin), 6) diet based on wheat–
soybean meal (with safizim+kombo), 7) diet based on wheat–soybean meal (with safizim+ kemin), 8) diet based
on wheat–soybean meal (with kombo+kemin), 9) diet based on wheat–soybean meal (with safizim+ kombo+
kemin). In starter period the highest amounts of daily feed intake and weight gain, in grower period the highest
amount of feed intake, in the end of experiment the highest amounts of daily feed intake and daily weight gain
have recorded in experiment group based on wheat–soybean meal (safizim+kombo). About carcass composition
the highest percent of breast and the lowest percents of liver and thigh were observed in experiment group based
on wheat–soybean meal (kombo+kemin), the highest percent of thigh was observed in experiment based on
wheat–soybean meal (with safizim), and the lowest percent of breast and highest percent of liver were observed
in experiment group based on wheat–soybean meal (with no enzyme). The lowest price for production per
kilogram of body gain was resulted in experiment diet based on wheat–soybean meal (with kemin).