Birds of (cobb 200) were fed on 8 plant mixes "maize" soya 48% and other feed supplements from 1-42 days. The results showed that adding enzymes mix increased the body weight of the birds accompanied by efficient feed conversion compared to the control. The results proved that adding enzynes to low energy (65) kilo calories diet did not affect either the feed conversion of the body weight on the contrary to the results obtained where the birds fed on low energy diet without any enzyme supplementaion. The same trend was followed for the phosphorus when the level decreased to (0.1%). Also the effect of the enzymes mix was very clear with the diets with low levels in both energy and phosphorus.