An investigation was made on weekly relative body weight gain (RWG) in two strains of Japanese quails, Black (3,438) and Brown (3,710) which were under selection for high 4-week body weight in 8th, 9th and 10th generations. The strain had significant (P<0.01) influence on relative weight gain; Black quails recorded higher relative weight gain (%) of 262.70+1.39, 128.56+0.85, 73.64+0.44 and 44.09+0.31 at first, second, third and fourth week of age respectively. At corresponding ages these values in Brown quails were 248.52+1.30, 120.61+0.80, 70.74+0.41 and 40.47+0.29 respectively. Sex effect was not significant on relative weight gain at all ages. The percentage of relative weight gain in males were 284.60+1.35, 123.64+0.83, 77.79+0.43 and 44.03+0.31, whereas in females these values were 256.62+1.29, 125.52+0.79, 71.58+0.41 and 44.53+0.29 respectively. Effect of Generation was significant on rate gain and highest weight gain was observed in ninth generation. Hatch effect was found to be significant on RWG but no specific trend was observed.
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