Estimation of parental genome proportion in reciprocally produced backcross chicken populations using RAPD markers

Two types of backcross (BC₁) populations were developed under marker assisted introgression program for naked neck gene. Type A population was produced by crossing naked neck F₁ (progenies of naked neck broiler sire and White leghorn dams) males with recipient WLH females, while reciprocal mating produced type B population. Naked neck grand sire and 76 BC₁ progenies (37 of type A and 39 of type B progenies) were genotyped with ten RAPD markers. The mean parental genome proportion of grand sire in BC₁ progenies estimated in terms of average band sharing proportion between them was 0.826±0.0115 and 0.887±0.0117 respectively in type A and type B populations. The mean genetic distance between grand sire and BC₁ progenies in type A and type B populations was 0.196± 0.019 and 0.123±0.013 respectively. The mean within population genetic similarity, estimated from band frequency respectively in type A and type B populations were 0.731±0.085 and 0.821± 0.056. The genetic similarity as well as genetic distance between type A and type B populations was 0.961±0.031 and 0.045±0.037, respectively.