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RISS 인기검색어
- 검색키워드
- 저자 : 오봉국 ( Y . H . Choi (검색결과 4 건)
- 무료
- 기관 내 무료
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최연호,오봉국 ( Y . H . Choi,B . K . Ohh ) 한국축산학회 1983 한국축산학회지 Vol.25 No.6
This study was carried out to present the informations for the optimum age of selection based on partial records to improve egg weight in layers. The data used in this study were the records on 787 White Leghorn hens from two different strains, A and K, which were raised at College of Agriculture, Seoul National University since 1976. The traits analysed in this study were mean egg weights in each period divided into 4 week intervals from first egg and annual mean egg weight in lines A and K. Heritability estimates for mean egg weight in each period from sire component and dam component were; different in appearance in two lines. In line A, the fact that heritability estimates from sire component was higher than those from dam component except for EW 22 suggested the importance of the sex-linkage effect on the inheritance of the traits studied. But the result of line K was shown to be reverse. The heritability estimate for EW 30 that is mean egg weight from 29 weeks to 32 weeks of age was higher than any other periods in line A. In the genetic correlation between. annual mean egg weight and mean egg weights in each period, the coefficient of EW 34 was 0.999 for line A and 0.900 for line K. The figures were highest among all genetic correlation coefficients. Results obtained above suggested that it might be possible to select hens at the period of 33-36 weeks of age to improve egg weight based on early part of the record.
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육용 종계의 주요 경제형질에 대한 유전변이 추정에 관한 연구 1 . 양면교잡에 의한 육용 종계 체중의 유전변이 추정
최광수,오봉국,여정수 ( Kwang Soo Choi,Bong Kug Ohh,Jung Sou Yeo ) 한국축산학회 1980 한국축산학회지 Vol.22 No.6
The study was conducted to obtain some genetic information for developing superior broiler breeder stock. Genetic variations were estimated with 997 progenies of $quot;4 × 4$quot; 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 into additive gene effects, dominance effects and heritabilities with Hayman`s model. The estimates of these effects were made with $quot;4 × 4$quot; dialled tables of three White Plymouth lock lines (RF, SF, TF) and a line of White Cornish (TM), and again with $quot;3 × 3$quot; diallel tables of three White Plymouth Rock lines in order to compare the effects from breed-crosses and line-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 slowed 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 Flock and White Cornish, respectively.
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난용종계의 산란능력을 개량하기 위한 초기 산란량의 선발효율에 관한 연구
최연호(Y . H . Choi),오봉국(B . K . Ohh) 한국축산학회 1990 한국축산학회지 Vol.32 No.11
This study was carried out to investigate the selection efficiencies of egg mass for improving egg production using short term records. Data for two layer pure lines, SCWL(single comb white leghorn) and BL (brown layer) which have been maintained at the Mani Breeding Farm were collected from 1980 to 1984 during 3 generations. The mean heritability of early egg mass(EM300) which were estimated from sib-analyses was 0.26∼0.36. Relative selection efficiencies of early egg number(EN300) to percent egg production(EP300) and egg mass(EM300) were estimated in order to investigate the effectiveness of the selected trait, EN300. It was seen that selection for egg numbers should increase total egg production by the shortening of age of maturity, while selection for percent production should increase total egg production more than it would decrease age at maturity. But it was concluded that the most influential trait for improvement of total ability of egg production including egg weight for whole producing periods was egg mass to 300 days of age, EM300.
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S. W. Han(韓成郁),B. K. Ohh(吳鳳國),M. Y. Lee(李文演),Y. H. Choi(李正九崔然皓) 한국육종학회 1981 한국육종학회지 Vol.13 No.3
Three commercial breeders of broiler were crossed in a 3×3 diallel to estimate combining ability and to find superior mating system. Total 1,181 progenies measured for 2, 4, 6, and 8 week body weight. Compared with pure strains, crossbred consistently showed heterosis in fertility, hatchability, early body weight and feed efficiency. General and specific combining ability and reciprocal effect all were highly significant for measures of body weight except at 2 weeks of age, while those was significant for feed efficiency only at 2 weeks of age. Superior mating systems were AB, BA and crosses.
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