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단관 백색레그혼계통간 교배단계별 경제형질에 대한 잡종강세 발현율 추정
정일정,정선부 ( I . C . Cheong,S . B . Chung ) 한국축산학회 1985 한국축산학회지 Vol.27 No.3
This study was carried out to estimate combining abilities and heterosis in Single Comb White Leghorns. The data were obtained over a 500 days period from Apr., 1983 to Sep., 1984 at the Livestock Experiment Station. A total of 1,260 birds were reared, and these birds were composed of 630 pure strains,378 two-way crosses and 252 four-way crosses. Average amount of heterosis expressed as a ratio was 3.81% for viability, 1.73% for sexual maturity, 2.76% for hen-day egg production, 5.24% for hen-housed egg production, 6.11% for egg weight,-9.41% for feed requirement and 6.30% for body weight at 500 days of age. Special combining ability and reciprocal effects were statistically significant for all of the traits examined in this study. Although the general combining ability was not significant for any of the traits, strain V appears to be superior to other strains in general combining ability.
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.
재래돼지 미토콘드리아 게놈내 D-loop 영역의 염기서열 분석
김태헌,윤두학,이효신,정일정,조진기 ( T . H . Kim,D . H . Yoon,H . S . Lee,I . C . Cheong,J . K . Jo ) 한국축산학회 1997 한국축산학회지 Vol.39 No.3
The purpose of this study was to investigate differences in restriction fragment length polymorphisms between mitochondrial DNAs(mtDNA) of Korean native pig and Landrace and to construct restriction map of the mtDNA of Korean native pig. When the mtDNA were digested with 16 different restriction enzymes of Apa I, Ava I, Barnes I, Bgl I, Bgl II, Cla I, EcoR I, EcoRV, Hind III, Hpa I, Pst I, Pvu II, Sac I, Sca I, Stu I and Xba I, to recognize 6 specific base pairs, restriction patterns of all the enzymes except for Bgl B and Sca I were identical between the two breeds. When digested with Bgl B and Sca I, seven out of ten Korean native pigs showed different band patterns from those of Landrace, but the other three showed the same patterns as those of Landrace. While five BamH I restriction fragments were reported in literature, the seven fragments were detected in this study. The restriction map of Korean native pig mitochondrial genome with 28 cleavage sites of 8 different restriction enzymes was constructed.
정일정(I . C . Cheong),여정수(J . S . Yeo) 한국축산학회 1989 한국축산학회지 Vol.31 No.5
Mapping of gene locus in dairy cattle is the basic step to manipulate genes for the purpose of developing superior performances. However, we do not know how many genes contributes to the traits and where it is located on the chromosomes. Research for the identification of gene locations in dairy cattle is in infant stage. but successful results in gene mapping in the human and experimental animals had been applied to disease etiology of cancer and gene manipulation. There are two different approachs toward the mapping of genes; (1) Gene transfer of hybrid clones between dairy cattle somatic cells and transformed mutant cells (somatic cell hybridization and chromosome mediated gene transfer). and (2) Direct assignment of genes by in situ hybridization of DNA of a specific type to fixed dairy cattle chromosomes. This study describes the methods and strategies in mapping genes and the present status of the gene maps in dairy cattle.
산란계의 경제형질과 연파란 (軟破卵) 발생비율에 관한 연구 3 . 산란계의 연파란율과 다른 형질과의 회귀
정일정(I . C . Cheong),정선부(S . B . Chung) 한국축산학회 1993 한국축산학회지 Vol.35 No.3
This study was carried out to investigate the relationship between frequency of soft and broken eggs and the economic traits for colored and white laying hens using the data sampled 7 times in Korea from 1985 to 1991. In addition, linear regression of frequency of soft and broken eggs on the economic traits for laying hens in order to decrease the frequency of soft and broken eggs were studied. The results obtained were summarized as follows : 1. Estimated line of regression equations by regressing FSBE on other traits were: (SM) Y = -3.4140+0.0278X; (HDEP) Y = 8.1727-0.0885X; (HHEP) Y = 4.4227-0.0120X; and (EW) Y = -1.1608+0.0367X during 18∼72 wks in colored laying hens. And for SM, Y = -3.8148 -+ 0.0312X, HDEP was Y = 8.5382-0.0929X, HHEP was Y = 4.4878-0.0107X and EW was Y = -1.6810+0.0472X during 18∼78 wks in colored laying hens. 2. Estimated line of regression equations by regressing FSBE on other traits were: (SM) Y = 0.2685-0.0009X; (HDEP) Y = 2.5833-0.0181X; (HHEP) Y = 2.7076-0.0058X; and (EW) Y = -2.6706+0.0638X during 18∼78 wks in white laying hens. And for SM was Y = 3.0858-0.011 2X, HDEP was Y = 2.5558-0.016X, HHEP was Y = 2.4808-0.004X and EW was Y = 1.1567+0.0029X during 18∼78 wks in white laying hens.
전익수(I . S . Jeon),김선의(S . E . Kim),정진관(J . K . Jung),정일정(I . C . Cheong),박영식(Y . S . Park),최광수(K . S . Choi) 한국축산학회 1993 한국축산학회지 Vol.35 No.6
The effect of micromanipulation and zona pellucida(ZP) on in vitro viability and development of frozen embryos was investigated for the effective cryopreservation of biopised embryos. The ZP-intact 4-cell embryos and ZP-removed 4-cell embryos were biopised using micromanipulator and micropipette, respectively. Biopsied embryos were equilibrated in M16 containing 3.5M DMSO and 0.25M sucrose for 1.5 minutes and then were ultrarapidly frozen in LN₂. The frozen embryos were thawed at 37℃ and were cultured in M 16 at 37℃ for 48 hours under an atmosphere of 5% CO₂ and 100% humidity. The developmental rate of fresh and frozen embryos was evaluated as percentage of embryo development from 4 cell stage to blastocyst. The results were summarized as: 1) the survival rate of 4-cell embryos ultrarapidly frozen and thawed was 73%. The development rate of survived embryos after freezing was 92%; 2) the survival rate of micromanipulated-embryos ultrarapidly frozen and thawed was 79?. The development rate of survived embryos after freezing was 59%; 3) the developmental rate of the cultured fresh ZP-intact embryos was significantly higher than those of the fresh ZP-removed embryos and fresh ZP-removed biopsied embryos (p$lt;.05); and 4) the developmental rate of the cultured frozen ZP-intact embryos was significantly higher than those of the frozen ZP-removed embryos and frozen ZP-removed biopsied embryos(p$lt;.05).
전익수,정일정,최광수,손시환 ( I . S . Jeon,I . C . Cheong,K . S . Choi,S . H . Sohn ) 한국축산학회 1997 한국축산학회지 Vol.39 No.1
The characteristics and a karyological study of chicken-quail hybrids were investigated. Fertility of the genus-crossing between chickens and quail was 18.3%, among which the hatchability was 4.9%. From the chromosomal analysis of the genuscrossbred between chickens and quail, 55.6% of the embryos were males and the ones that hatched were all males, Average body weights of the genus-crossbred between chickens and quail were 197.8g at 8 weeks of age and 329.9g at 12 weeks of age, which were heavier than those of male quails of 128.2g and 126.4g at similar ages. The growth of the genus-crossbred was much faster than that of quails after 6 weeks of age. The origin of chromosomes 1, 2, and 4 from embryos and leukocytes of the chicken-quail hybrids was distinguished from chicken and quail. Differences of morphological features were not significant among tissues.
정선부,정일정 ( S . B . Chung,I . C . Cheong ) 한국축산학회 1985 한국축산학회지 Vol.27 No.10
This study was carried out to estimate the heritabilities of hatching time, chicks weight and ratio of chick weight to egg weight. The data used in this study were the records of 1,090 chicks from two strains of white Leghorn. The hatching times were a few differ between strains but big differences were showed among families. The positive genetic correlations estimated both sire and dam components were 0.274 between hatching time and chick weight, and 0.289 between chick weight and ratio of chick weight to egg weight.
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.
S. B. Chung(鄭船富),I. C. Cheong(鄭鎰錠) 한국육종학회 1983 한국육종학회지 Vol.15 No.3
The study was carried out to investigate the efficient selection method for the improvement of growth rate of broiler breed. Eight hundred chicks from the straight breed of White Cornish and White Plymouth Rock were used for this study. The heritabilities and genetic correlations were estimated for body weight, breast angle, keel length and shank length and, various selection indexes were calculated with body weight, breast angle, keel length and shank length at 4, 6 and 8 week of age. Based on the results of this study, index selection with body weight, breast angle and keel length at 6 weeks of age was most efficient for the improvement of growth rate of broiler breed.