This study was conducted to determine the effects of sumac, yeast, and onion supplementation to broiler chicken feeds on performance. Four hundred and fifty, one-day-old Ross 308 broiler chicks were obtained from Yagoo Group Hatchery in Sulaymaniyah Province and were randomly distributed into three treatment groups (150 chicks for each group) with six replicates (each 25 chicks). Chicks were raised on floor cages (210 × 200 × 100 cm). T1 (Feed with 0 mg kg-1 sumac, yeast, and onion), T2 (Feed with 10, 2 and 20 mg kg-1 sumac, yeast, and onion for every day) and T3 (Feed with 10, 2 and 20 mg kg-1 sumac, yeast, and onion for 2 days added and 2 days free in the rearing period) experiment groups were constituted. In the study, the effects of the treatments on the performance parameters were found to be statistically significant. In body weight, the highest group in terms of total body weght gain and total feed intake was T3, and it was significantly higher than T2 and control groups (p

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