The study aimed to evaluate the influence of adding antibiotics (NEOMYCIN) and different levels of crushed (Thymus vulgaris) leaves on the growth performance of Partridge bird. The study was conducted from 8/11/2018 to 7/2/2019 in the college of Agriculture/ University of Kirkuk, The 100 Birds of partridge were allocated randomly from 28 days old to five treatment groups with four replicates per group, according to these treatments:T1: Basal diet (control group without any additives), T2: Basal diet+(NEOMYCIN) antibiotic at 0.05g/ Kg diet, T3: Basal diet+thyme powder at 1g/Kg diet, T4: Basal diet+thyme powder 3g/Kg diet., T5: Basal diet+thyme powder 5g/Kg diet. The study showed a significant increase in weekly body weight and body weight gain significant decrease in feed intake when compared with the control group, and a significant difference was noted in feed conversion ratio between.