Abstract Eggs were obtained from eight commercial egg production houses over 12 months. The effects of age of bird and season of the year on Haugh units and egg composition were analyzed. Haugh units decreased significantly and egg weight increased significantly as age of bird increased. No seasonal effects on either Haugh units or egg weight were observed. Yolk weight and percentage of yolk increased significantly as the bird aged but were not significantly affected by season of the year. Albumen weight increased as the age of bird increased, whereas percentage of albumen decreased due to the increase in percentage of yolk associated with increasing age of bird. No seasonal effects were noted.