In thıs 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 for selectıon. ı, 2, 3, 4 and 5 week body wei9hts were 15.57-29.34 9. 33.04-70.04 9. 57.37-114.40 9. 86.86-154.46 9 and 112.06· 183.23 g, respectively. O, 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, 743, 22.89, 51.25, 83.45, 114.06 and 145.18 g in low line, 8.34, 25.68, 57.89, 97.66, 133.26 and 171.40 g In hıgh line. In generatıon 5, during 5-week daily gains for randombred. low and hı9h line were 4.78. 4.14 and 5.54 g, daily feed comsumptıon were 16.02, 14.49 and 18.98 g. feedlgain were 3.35, 3.50 and 3.43 kg, respectively.