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 18d of incubation,LOW-Inc)or high(38.5 °C/6 h/d from 10–18d of incubation, HIGH-Inc)incubation temperatures.