Mapping Quantitative Trait Affecting Live Weight on Chromosome 5 in Japanese Quail

The purpose of this work was to scan chromosome 5 for mapping QTL affecting live weight in an F2 population. A three generation resource population was developed by using two distinct Japanese quail strains, wild and white to map quantitative trait loci underlying hatching weight and growth traits. Eight pairs of white (S) and wild (W) birds were crossed reciprocally and 34 F1 birds were produced. The F1 birds were intercrossed to generate 422 F2 offspring. All of the birds from three generations (472 birds) were genotyped for three microsatellite markers on chromosome 5. Studied traits in this research were live weight from hatch to 5 weeks of age. QTL analysis was conducted applying the line-cross model and the least-squares interval mapping approach. In different situation QTL were live weight at hatch, live detected for weight at 1 week and 2 week. Although was theadditive effect for detected QTL significant but the dominant and tmprinting effects on these traits was not significant and the variance explained by the detected additive QTL effects ranged from 1.1 to 3.6 for different tariats.