The present experiment was conducted to determine the effects of supplemental oil and methionine on performance and egg, quality of laying hens from two commercial strains (white and brown) at high summer temperature. A 2 x 2 x 3 factorial arrangement consisting of two strains of commercial laying hens (white and brown), two levels of supplemental methionine (0 and 1 g/kg) and three levels of supplemental soybean oil (0, 20 and 40 g/kg) were used in this study. Thus, six experimental diets were formulated on isoenergetic and isonitrogenous basis.