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The aim of the study was to investigate eggshell traits; including eggshell water vapor conductance, eggshell thickness, pore density, egg weight loss as well as eggshell surface area and volume in 28 and 40 week-old broiler breeders. Furthermore, the phenotypic correlations among the eggshell characteristics were determined. the eggs were ranged from 54.41 g to 60.78 g and 54.71 g to 60.62 g in 28 and 40 wk-old age groups, respectively. All eggs were weighed and numbered before setting and were monitored individually until the end of the incubation. Mean eggshell water vapor conductance (G) value was 11.00 +/- 1.01 mg H2O day(-1) torr(-1) in 28 wk-old flock and 11.99 +/- 1.28 mg H2O day(-1) torr(-1) in 40 wk-old flock respectively (P, commercial breeder farm HasTavuk, We would like to thank commercial breeder farm HasTavuk for their support and contribution.