Estimation of genetic variation in economic traits of broiler breeder stock
1980
Choi, K.S. (Kyungbuk National Univ., Daegu (Korea R.). Coll. of Agriculture) | Ohh, B.K. | Yeo, J.S. (Seoul National Univ., Suwon (Korea R.). Coll. of Agriculture)
The study was conducted to obtain some genetic informati ' for developing superior broiler breeder stock. Genetic variations were estimated with 997 progenies of "4 x 4" dialled crosses. The progenies were raised at the Livestock Experimental Farm, College of Agriculture, Seoul National University from March, 1974 to June, 1975. Body weights at 8, 24 and 64 weeks of age were investigated and analyzed for additive gene effects, dominance effects and heritabilities with Hayman's model. The estimates of these effects were made with "4 x 4" dialled tables of three White Plymouth Rock lines (RF, SF, TF) and a line of White Cornish (TM), and again with "3 x 3" dialled tables of three White Plymouth Rock lines in order to compare the effects from breed-crosses of the same breed. In body weights at the ages of 8 and 24 weeks, the genetic variation due to additive among parental lines showed significant differences in both cases of breed-crosses and line-crosses. However, dominance effects appeared in case of breed-crosses, and the effects of overall dominance and line dominance showed significant differences. No significant differences were observed in genetic variation on body weight at the age of 64 weeks. Heritability estimates for the body weights at the age of 8, 24 and 64 weeks were 0.77, 0.74 and 0.14 in the White Plymouth Rock; and 0.49, 0.35 and 0.08 in the crossbred of White Plymouth Rock and White Cornish, respectively.
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