بررسی جایگاه صفت کمی موثر بر صفات رشد در بلدرچین ژاپنی با استفاده از طرح ناتنی پدری

     A paternal half-sib design was implemented to identify QTL on chromosome 2 affecting growth traits in Japanese quail. Using a reciprocal cross between two strains, white (laying) and wild (broiler) of Japanese quail, 34 birds were obtained in F1 generation and 422 offspring related to 9 paternal half-sib families in 5 consecutive hatches were generated. Progeny from 9 paternal half-sib families were measured for growth traits, and genotyped for four microsatellite markers on chromosome 2. QTL analysis was performed with least squares interval mapping method based on regression in across and individual paternal half-sib families. In addition to the QTL responsible for Kleiber ratio, other QTLs related to growth in positions 13, 51, 53, 54 and 55 cM, (P<0.05) and 50 cM, (P<0.01) were identified. Percentage of trait phenotypic variation explained by QTL ranged from 0.01 to 5.16 and the average of useful polymorphism information content of the markers in different parts of the chromosome 2 (both in-between and at the markers) was 0.58 and ranging from 0.41 to 0.71. Most probably the traits located near a specific marker have polytrophic effects which are important traits in breeding quail. The results showed that the mentioned traits are highly related to each other. If approved by segregating QTL detected in commercial strains of quail, the results of this study can be used in marker-assisted selection programs.