In this study, Japanese quails were divergently selected during generations 1 to 5 for high and low 5-week body weight. Quail weights at hatch across generations were between 7.37 and 8.21 g. Following 5 generations tor selection. 1, 2, 3, 4 and 5 week body weights were 15.57-29.34 g. 33.04-70.04 9, 57.37-114.40 9. 86.86-154.46 g and 112.06-183.23 g, respectively. 0, 1, 2, 3, 4 and 5 week body weight means 7.75, 24.24, 55.37, 91.32, 125.12 and 156.51 9 in randombred line, 7.43, 22.89, 51.25, 83.45, 14.06 and 145.18 g in low line, 8.34, 25.68, 57.89, 97.66, 133.26 and 171.40 g in high line. In generation 5, during 5-week daily gains tor randombred, low and high line were 4.78. 4.14 and 5.54 g, daily feed comsumption were 16.02, 14.49 and 18.98 g. feed/gain were 3.35, 3.50 and 3.43 kg, respectively.