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Phytogenics are being considered a suitable alternative to antibiotics as growth promoters. In the current experiment, five hundred 40-day-old Cobb 500 broiler chickens were randomly allotted to five treatments as follow: control (basal diet only), basal diet + Ajwan powder (10 mg/kg of feed), basal diet + Coriander powder (10 mg/kg of feed), basal diet + black Cumin powder (10 mg/kg of feed), basal diet + protease enzyme (30,000 IU/kg). The results showed that feed intake was significantly (P < 0.05) higher in Coriander and protease treated birds at the end of the starter and finisher phases. On overall basis, body weight was significantly (P < 0.05) higher in protease, black Cumin and Coriander treated birds compared to the control. Feed conversion ratio was significantly (P < 0.05) improved in black Cumin and protease enzyme treated birds compared to the control. The results indicated that muscle fibre diameter, muscle fibre cross sectional area, muscle fascial diameter and muscle fascial cross sectional area were significantly (P < 0.05) higher in protease and black Cumin supplemented birds compared to the control. From the results of the present study, it was concluded that the performance and muscle histology were significantly improved in protease enzyme and phytogenics treated broiler.