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産卵鷄種의 主要經濟形質에 대한 結合能力 推定에 관한 硏究
OHH B.K(吳鳳國),J.S. YEO(呂政秀),J.K. LEE(李正九),M.Y. LEE(李文演) 한국육종학회 1980 한국육종학회지 Vol.12 No.3
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.
난용계 모체유전효과를 이용한 유전변이 추정에 관한 연구
여정수,오봉국 ( J . S . Yeo,B . K . Ohh ) 한국축산학회 1982 한국축산학회지 Vol.24 No.1
Data from the 1,131 birds of synthetic population (A) and 1,587 birds of selected population (D) for three generations were analyzed to determine the different components; additive variance, maternal genetic variance and covariance between additive-maternal genetic effects of economic traits. Coefficients of variations of mean performances in synthetic line were decreased and those of selected line were nearly constant year by year. It was found that maternal genetic variances were important in all traits except egg weights before 43 weeks of age in both lines, showing greater values in synthetic line than in selected line. Correlations with additive-maternal genetic variances, when present, were highly negative in all traits which seemed to influence to derive difference between heritabilities from sire and dam variance components through sib analysis in the absence of dominant effect. Adjusted heritabilities included additive variance, maternal genetic variance and covariance between additive-maternal genetic effects were large in body weights at different age and small in egg numbers and initial egg weights of both lines.
여정수(J . S . Yeo),정일정(I . C . Cheong),정경진(K . J . Chung),정선부(S . B . Chung),정연후(Y . H . Jung),이기복(K . B . Lee),설동섭(D . S . Sul),오봉국(B . K . Ohh) 한국축산학회 1990 한국축산학회지 Vol.32 No.9
Through chromosomal analysis of 109 heads of the Korean Native Cattles, this research was observed results as follows; 1. Six heads(5.5%) were cosisted of two kinds of mosaic chromosomal spreads( I : monosomy, normal and trisomy II: monosony and normal) and these mosaicsms were variated at #29 chromosome. 2. One head was showed supernumery chromosome suggested B-chromosome. 3. 1/29 Robertsonian translocation was not found in the Korean Native Cattles.
여정수(J . S . Yeo),김재우(J . W . Kim),최창본(C . B . Choi) 한국축산학회 1994 한국축산학회지 Vol.36 No.3
This study was conducted to genetically identify chicken breeds, especially the Korean Native Chickens (KNC). Genomic DN.A was extracted from live breeds of chickens, including KNC, and digested with the restriction enzyme, Hae III. DNA fingerprinting was applied to the digested DNA using the single stranded bacteriophage M13 DNA as a probe. There were 6 to 26 hypervariable polymorphic bands, between 0.5 and 8 Kb, in each lane. KNC genomic DNA contained 3 breed-specific bands compared to the other chicken breeds. As the purity determined by phenotypes of KNC increased, these breed-specific bands appeared with higher frequencies. Band shaping ratios among breeds indicated that KNC is closer to an egg-laying breed than a meat type breed. The results indicate that DNA fingerprinting is a powerful tool to identify chicken breeds and to study population genetics. Further studies are necessary to keep and maintain pure KNC using DNA fingerprinting.
DNA 지문을 이용한 한국 토종닭의 유전적 소질에 관한 연구
여정수(J . S . Yeo),김재우(J . W . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.4
In order to identify the genetic compositions of the grey brown Korean Native Chicken(gKNC), this study was compared to other 6 strains of birds by DN.A fingerprintings. The gKNC was nearly fixed as genetic strain in homozygotic ratio and band sharing within grain of DNA bands. Band sharing of inter-strain of the gKNC with yellow brown Native Chicken was showed high similarity(0.76), and considerable band sharing of 0.325 with commercial broiler was suggested possibility of improvement as meat type. Through pedigree analysis of DNA bands, paternal DNA bands of gKNC were inherited significantly higher than maternal to progeny. Strain specific band, genetic composition of meat type, and powerful inheritance of sire would be important tools to improve the grey brown Korean Native Chicken in a future.
여정수(J . S . Yeo),정경진(K . J . Chung) 한국축산학회 1991 한국축산학회지 Vol.33 No.8
An experiment was carried out to identify the chromosomal characteristics of the Korean Native Pig by comparing its morphological features with those of the Landrace breed. The results obtained from this study are as follows ; l. The Korean Native Pig had 38 chromosomes composed of 36 automosomes and 2 sex chromosomes. The length of p-arm in #2, 7, 8, 9, 11, 12, X and Y chromosomes of the Korean Native Pig was significantly shorter than those of Landrace breed. 2. The G-banding pattern in #l, 9 and X of the Korean Native Pig had distinctive bands which were different from those of Landrace breed. The #11 of the Korean Native Pig had a distinctive dark C-band at centromere while that of Landrace has a light hand. The #15 chromosome of Landrace breed had a more broad and distinctive band than that of the Korean Native Pig.
염색체의 배수성 증가에 의한 닭의 신품종 개발 2 . 다배수성 개체의 생산
여정수(J . S . Yeo),정선부(S . B . Chung),오봉국(B . K . Ohh),정경진(K . J . Chung) 한국축산학회 1990 한국축산학회지 Vol.32 No.10
For the induction of polyploid chicken. 660 birds were supressed by tri-ethylene melamine(0.25mg/2kg B.W) and 330 fertilized eggs from chicken of 24 hours laying cycle were incubated. Only 65 chickens Acre hatched in observation of many dead eggs and pips caused to unbalanced genetic structure. At 10-12 weeks of age chromosomal structures of 55 chickens were analysed in blood culture and 4 of them were identified as polyploid (3A+ZZW). Characteristics of polyploid chickens were heavier weight 21% and 88% than normal male and female at 30 weeks of age, sterility of female and weak legs. Through analysis of chromosomal structure of G-and C-banding polyploid chicken were observed the three pairs of chromosomes without specific genetical disorders.
염색체의 배수성 증가에 의한 닭의 신품종 개발 1 . 다배수성 배아의 생산
여정수(J . S . Yeo),정선부(S . B . Chung),오봉국(B . K . Ohh),정일정(I . C . Cheong) 한국축산학회 1989 한국축산학회지 Vol.31 No.5
Tri-ethylene melamine (0.25-0.3㎎/2㎏ body wt.) which inhibits partially gametogenesis to produce the polyploid embryos was injected 4 hours before ovulation to dual purpose chicken with 24 hours egg cycle. After artificial insemination 78-83% of fertilization rate and 44% of triploid embryos of fertilized eggs were observed. Times of meiosis I and Q during oogenesis detected by the sex chromosomes of triploid embryos seemed to be at 2-4 hours before ovulation and duration meiosis Ⅱ was shorter and more irregular than that of meiosis I.
S.B. CHUNG(鄭船富),K.C. HONG(洪起彰),B.K. OHH(吳鳳國),J.S. YEO(呂政秀) 한국육종학회 1979 한국육종학회지 Vol.11 No.2
The purpose of the present study was to evaluate the relative economic importance of the major production traits in laying hens. Based on the results of this study, it was showed that feed requirement, average egg weight and hen-housed egg production influenced greatly on the income over feed and chick cost.
여정수 ( J . S . Yeo,R . N . Shoffner ) 한국축산학회 1986 한국축산학회지 Vol.28 No.6
Identification of gene locus for domestic animals is the basic step to manipulate gene for the purpose of developing superior individual. Somatic cell hybridization with chicken fibroblast and mouse tumor (Thymidine kinase deficient, TKO cells was available to induce heterokaryote and was found result that normal TK cell included chromosome #7 of chick. Therefore, thymidine kinase gene located at chromosome #7 in chicken.