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This study was designed to determine the effect of prenatal temperature conditioning on hatching and live performance of laying chickens, and response to heat and cold stress during laying period. A total of 3600 eggs obtained from ATAK-S brown parent stock were incubated at control (37.5 °C, CONT-Inc), cyclic low (36.5 °C/6 h/d from 10 to 18 d of incubation, LOW-Inc) or high (38.5 °C/6 h/d from 10–18 d of incubation, HIGH-Inc) incubation temperatures. Hatched chicks per incubation temperature were reared under standard rearing conditions up to 26 wk. From 27 to 30 wk, hens from each incubation temperature were divided into 3 environmentally controlled rooms and reared at control (20±2 °C, CONT-Room), low (12±2 °C, COLDS) or high (32±2 °C, HEATS) temperatures. Hatching performance, body weight, egg production, and plasma triiodothyronine (T₃) and thyroxine (T₄) levels and oxidant and …