The present study aimed at the evaluation of growth performance, carcass characteristics and related physiological aspects of two different quail genotypes reared under different environmental conditions. A total of 180 quail birds, 8 days of age, of brown and white genotypes were used in this study and divided into two equal groups. Each genotype group was further divided into two subgroups; one subgroup of each genotype was subjected to cyclic heat stress (34˚C/8h, then 24˚C/16h), and the other subgroup was reared under control environment condition (24±1˚C) and served as the control. Feed intake, body weight gain and feed conversion ratio were determined and carcass characteristics were obtained. Blood samples were collected to measure total protein, albumin, cholesterol, triglycerides, AST, ALT, calcium, phosphorus, H/L ratio and total white blood cells. Also, tibia ash, calcium and phosphorus contents were determined. Rectal temperature was recorded. The effect of genotypic variation was noticed in all growth traits and carcass characteristics, revealing that white quail was higher in meat production. The results showed that heated stressed white quail had higher (P>0.01) initial and final body weight than brown quail. The effect of heat stress conditions on blood constituents was prominent. The effect of genotype on blood constituents was not observed, except for the total protein, calcium, AST and ALT. It can be concluded that the white quail genotype has the potential to deposit more meat, especially under high environmental temperature.