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¹ Tavukçuluk Araştırma Enstitüsü Müdürlüğü – Ankara - This study was conducted with total 4050 breeding eggs obtained from ATAK-S parents aged 44 weeks according to the randomized parcels experimental design with the aim of determining the effects of pre-warming on hatching traits. The eggs were stored 8 days and then were allocated to treatment groups. Treatment groups were control (C); 24 ºC -8 hours; 24 ºC- 12 hours; 24 ºC -18 hours; 24 ºC -24 hours; 28 ºC-8 hours; 28 ºC-12 hours; 28 ºC -18 hours; 28 ºC -24 hours. Each treatment group consisted of 3 replications with 150 eggs in each replication. There were no significant differences among control and other groups in terms of hatchability, hatchability of fertile eggs, early embryo mortality ratios, middle embryo mortality ratios, late embryo mortality ratios. Keywords : Pre-warming, stored period, hatching traits