産卵鷄種의 主要經濟形質에 대한 結合能力 推定에 관한 硏究

Estimation of Combining Ability for Economic Traits in Layer Chicken

This study was carried out to estimate combining abilities for economic traits in layer chickens. The data used in this study were the record of 10 single crosses produced by half diallel cross of 5 lines of Single Comb White Leghorns, such as A, B, C, K and S lines. Total 720 progenies of the crosses were reared at the Poultry Breeding Farm, College of Agriculture, Seoul National University from Feb. 1979 to August, 1980. Combining abilities were estimated by Griffing’s mathematical model for the traits; age at the first egg, total egg number, egg weight and body weight. The results abtained from the studies were summarized as follows; in estimate of combining ability, an age at first egg of BS cross was largely due to significiantly higher general combining ability (G.C.A) effect of B and S strains than C and K strains in G.C.A. effect, and to specific combining ability (S.C.A) effect of B and S strains. AB and BS crosses showed the highest egg production. AB cross performance was result from high G.C.A. effect of A and B strains.BS cross performance was result from high G.C.A. effect of B and high S.C.A. effect of BS cross. Specific combining ability effect in egg weight was not statiscally significant, but S strain showed high G.C.A. effect. A and B strains in body weight showed significantly low G.C.A. effect. From the above results, BS cross in an age at first egg, AB and BS crosses in egg production, S strain in egg weight and AB cross in body weight were superior to other strains or crosses.