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Data on 29,411 quails of two selected lines along with a control line were examined over nine generations.Significant genetic gains/generation for 4-week body weight were realized in the two strains (3.70 and 3.10 g).Significant correlated genetic changes were also observed in early body weights (day-old to 3-weeks) as well asin 16-week body weight. Egg number and sexual maturity did not show any significant response while eggweight and egg mass showed desirable genetic gains. Natural selection did not seem to exert any effect.Inbreeding levels of 0.32 to 0.43 % per generation did not appear to be of any significance in affecting theresponse. Realized heritabilities (0.21–0.24) were reasonably consistent between sexes and matched fairly wellwith the nine-generation pooled sire-component heritabilities of 0.20 ± 0.04 and 0.25 ± 0.04 in the two lines. Therewas evidence of maternal effects as indicated by excess of dam- over the sire-component heritability. Time-trendin heritabilities was non-significant. There was good agreement between the predicted and realized geneticgains

Direct and correlated responses to selection for 4-week body weight in two lines of Japanese quails