investigation the effects of different commercial multienzymes and nutrients levels of diets on performance and carcass traits of broilers

this experiment was conducted to evaluate the effects of different commercial multi enzymes and nutrients levels of diets on performance and carcass traits of broilers. in this experiment 288 day old ross – 308 broilers (male and female) were used as (2*4) factors include: two levels of nutrients in diets (ross- 308 nutrients recommendation and 5% less than ross- 308 nutrients recommendation) and three multi enzymes (saphizym, kimin, combo and control group) in a completely randomized design in 8 treatments, 3 replicates and 12 birds in each replicate from 10-42 days. the results showed that in starter, grower and finisher period, reducing 5% of diets nutrients levels less than ross- 308 nutrients recommendation did not have any adverse effects on performance of broilers; however increased the abdominal fat percentage. in starter period using commercial enzymes improved the broilers performance, but in starter and finisher periods they could not positively affect the broilers performance. commercial multi enzymes did not have any effects on carcass traits of broilers. interaction between diets nutrients levels and multi enzymes did not have any significant effects on performance and carcass traits of broilers (p>0.05). the overall results indicated that in broilers, reducing 5% of diets nutrients levels less than ross- 308 nutrients recommendation did not have any adverse effects on performance of broilers, however increase the abdominal fat percentage and using commercial multi enzymes did not have any positive effects on performance and carcass traits.