肉用 種鷄의 主要 經濟形質에 對한 遺傳變異 推定에 關한 硏究 : Ⅲ.兩面交雜에 依한 肉用 種鷄 卵重의 遣傳變異 推定 Ⅲ.Estimation of Genetic Variations in Egg Weight of Broiler Breeder Stock by Means of Diallel Crosses = Estimation of Genetic Variations in Economic Traits of Broiler Stock

다국어 초록 (Multilingual Abstract)

The study was conducted to obtain some genetic information for developing superior broiler breeder stock. Genetic variations was estimated with 997 progenies of "4x4" diallel crosses. The average egg weight was investigated and analyzed into additive gene effects. dominance effects and heritabilities with Hayman's model. The estimates of these effects were made with "4x4" diallel tables of three White Plymouth Rock lines(RF, SF, TF) and a line of White Cornish(TM), and again with "3x3" diallel tables of three White Plymouth Rock lines in order to compare the effects from breed-crosses and line-crosses of the same breed.
The additive gene effects on the average egg weight appeared to be significant in breed-crosses and no genetic variations were observed in line-crosses. in respect to the dominance effects, only overall dominance effects appeared to be significant in breed-crosses. The dominance effects in breed-crosses appeared to be over-dominant, and the existence of recessive allele appeared to be in the parental lines. Heritability of the average egg weight was estimated to be 0.09 in the White Plymouth Rock and 0.19 in the crossbreds.