The objective of this study was to assess the effect ambient temperature (T) and feeding time (FT) on eggshell thickness (ST) egg weight (EW) broiler breeder hens. Thirty 44-week-old Ross 308 hens were randomly distributed into six environmentally controlled chambers kept in individual cages. Three thermal treatments applied: 20 ºC (T1), cyclic 20-30 (30 °C between 1000 h 1800 h) (T2), 30 (T3)....