더러브렛 경주마에 있어서 HMS7 과 EA2C4 Microsatellites 를 이용한 친자감별

이광전,이연근,박경도,김정언,안준천 ( K . J . Lee,Y . K . Lee,K . D . Park,J . U . Kim,I . C . An ) 한국축산학회 1996 한국축산학회지 Vol.38 No.1

더러브렛 경주마의 수득상금에 대한 유전모수 추정

이광전,박경도,안준천,김삼수 ( K . J . Lee,K . D . Park,J . C . An,S . S . Kim ) 한국축산학회 1997 한국축산학회지 Vol.39 No.1

This study was undertaken to estimate genetic parameters for earnings using a total of 9,534 annual earning records from 3,851 horses that had raced from 1990 to 1995. Results obtained were as follows. The annual earnings showed a non-normal distribution, skewing extremely to the right. However, after being standardized by age-birth year groups, the annual earnings appeared to have an almost normal distribution. The unraced ratio per year among 2 year old horsed was highest(44.5%). Consequently, the annual earnings were the lowest compared to other age groups. Heritability and repeatability of the standardized annual earnings were 0.166 and 0.303, respectively. These results suggested that the annual earnings should be standardized by means and standard deviations of age-birth year, groups, considering the phenotypic and genetic correlations between annual earnings and standardized annual earnings were 0.676 and 0.817, respectively.

PCR 기법을 이용한 한국내 젖소의 k- casein 과 β- lactoglobulin 유전자형 분석에 관한 연구

이광전(K . J . Lee),김정언(J . U . Kim),이연근(Y . K . Lee),홍경표(K . P . Hong),김경수(K . S . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.4

This study was performed to offer rapid and accurate methods of both sire selection and dairy cattle improvement, according to analyzing loci of κ-casein and β-lactaglobulin in Korean dairy cattle. The blood samples used in this study were taken from the 45 Holstein cattle in the nearby Kyung gi province, where milk was sold to Kon-Kuk milk plant. The results obtained were as follows; 1. This study established the extracting method of high quality DNA from the 45 Holsteins blood samples by using phenol and the analysis of κ-casein and β-lactoglobulin polymotphisms by using PCR. 2. Due to the amplification of κ-casein and β-lactoglobulin loci by using PCR, this study confirmed amplified products of 8746p and 961bp, respectively. 3. Due to the restricted enzyme digestion of Taq I and Hind Ill in amplified products of κ-casein, AA type with Hind III and Taq I showed no change of size in amplified products and BB type with Hind III showed 525bp and 350bp fragments and with Taq I showed 558bp and 317bp fragments, respectively. 4. Due to the restricted enzyme digestion of Hph I in amplified products of β-lactoglobulin, all lanes which were digested by restriction enzyme showed 961bp and 741bp fragments and A.4 type showed 220bp, while AB type showed 220bp and 166bp, and BB type showed 166bp fragments, respectively. 5. The κ-casein genotype of Holstein by restricted enzyme digestion gives frequencies of 75.55%, 17.78%, and 6.67%r for AA, AB, and BB types and for A and B alleles being 0.84 and 0.16, respectively. Restriction enzyme digestion of the β-lactoglobulin genotype of Holstein gives frequencies of 34.38%, 43.74%, and 21.88% for AAA, AB, and BB types and for A and B alleles being 0.56 and 0.44, respectively. 6. The fitness test(x²-test) for genotype frequencies of κ-casein and β-lactoglobulin showed gene equilibrium with AA. AB and BB, and β-lactoglobulin indicated Hardy -Weinberg equilibrium in the ratio of being 1:2:1. 7. The genotyping of κ-casein and β-lactoglobulin loci can be utilized for finding the association between genotypes and production traits in dairy cattle.

MOET 의 교배계획에 따른 근친계수와 선발반응의 변화

이광전(K . J . Lee),김원산(W . S . Kim),이연근(Y . K . Lee),강민식(M . S . Kang),장길원(K . W . Chang),김준식(J . S . Kim) 한국낙농학회 1999 韓國酪農學會誌 Vol.21 No.1

N/A N/A

더러브렛 경주마의 경주시간에 대한 거리 보정계수

이광전(K . J . Lee),박경도(K . D . Park),안준천(J . C . An),김계회(G . H . Kim),원진희(J . H . Won) 한국축산학회 1995 한국축산학회지 Vol.37 No.1

The objective of this study was to develop adjustment factors for racing distances, using a total of 53,097 racing records from 2,928 horses that had raced from January, 1990 to December, 1993. Results obtained were as follows. 1. Skewedness for racing time by each distance was near zero, and the data skewed a little to the right. 1Me entire data, however, was almost normally distributed. 2. Racing frequencies for progeny per sire decreased with increasing racing distance. In the case of the 2,200m race in which the largest number of exellent horses took part in competition, one record per sire was most widely distributed and the proportion was about 88% of all data Considering the unique distribution of Korean racing data, it was suggested that the entire data for various distances should be used for the genetic evaluation of racing horses. 3. Contemporary group effect for racing time made up about 40% of total variation, and this implied that contemporary effect was one of the important environmental factors for the genetic evaluation of racing horses. 4. Variances adjusted by additive factors showed homogeneous values for various distances, while those adjusted by multiplicative factors deviated greatly from unadjusted data, with increasing racing distances. 5. Correlations between PTA`s for additive adjusted and unadjusted records were shown to be about 0.99. This fact led to the suggestion that the additive adjustment factors would be more practical and reasonable for adjustments of racing distances.

더러브렛 경주마의 경주형질들에 대한 유전모수의 추정

이광전(K . J . Lee),박경도(K . D . Park),강민구(M . G . Kang),김덕락(D . R . Kim),문윤영(Y . Y . Moon) 한국축산학회 1995 한국축산학회지 Vol.37 No.1

The results obtained from a total of 18.926 rating records of 1,345 horses, from the Korea Racing Horse Association were as follows. 1. Square root transformations for total money (TM), average money (TM/S), curd percentage of first through second rank(% FSR) with a single record were more normally distributed than having natural logarithms. 2. Heridbility estimates for lest time average time. /TM/S, and / % FSR with entire records were 0.41, 0.53, 0.39, and 0.33, respectively. And heritabilities for the carne traits in 3-year-old horses generally showed highest. Taking account of genetic correlations among performance traits being always larger than those of phenotype, it was indicated that environmental factors were very important in racing taut, of horses. 3. the performance traits with repeated records were racing time, placing, and money in a race. Square root transformation of money in a race was more useful than that of natural logarithm, just like average money (TM/S). Considering the uniform distribution of placing records, transformation of placing records was implied to be important. 4. The estimates of heritibilities for racing time, money and placing in a race were 0.23, 0.10, arid 0.14, respectively. On the other hand, repeatabilities for the same traits were 0.34, 0.21, and 0.15, respectively. Taking in account racing time as being a good indicator of environmental effects, it should be considered as the most important trait in the genetic evaluation of racing horses. 5. PTAs` corelations between single records arid repeated records for racing traits were relatively high, and the same trend was found by age groups. Both genetic and phenotypic correlations for performance traits by age groups ranked highest in 4-year-old horses. This indicated that racing records for 4-year-old horses were very important for the genetic evaluation of racing horses.

더러브렛 경주마의 경주시간에 대한 성 - 연령별 보정계수

이광전(K . J . Lee),박경도(K . D . Park),강민식(M . S . Kang),최우섭(W . S . Choi),김태종(T . J . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.1

After analyzing a total of 53,097 racing records for 2,928 horses from Korea Racing Horse Association, the results obtained were as follows. 1. Sex-age effect was subdivided into 72 groups, and horse effect was regarded as random(σ²e/σ²h = 1.94). 2. Fifty, four to 56 month-old groups took the largest portion of the total records. Racing performance for geldings, stallions, and mares reached their peaks at 4.5, 4.3, and 3.5 years old, respectively. Comparing with the foreign peak years of 5-6 for racing hones, those in domestic horses were much younger. Due to poor management and frequent races, racing lives of horses were shortened and might result in economic losses. 3. Because geldings are included in the classification of male by KRHA, it is likely that the racing performance for geldings might be underestimated, while stallions may overestimated. 4. Variances for both additive and multiplicative adjustments were the same at 2.68. Correlations between means and standard deviations for racing time by age groups were -0.06, and this low correlation led to the suggestion that additive adjustment factors for racing time were much easier and more desirable.

가계분석에 의한 k- casein 과 β- lactoglobulin 의 유전자형 분리에 관한 연구

이광전(K . J . Lee),김정언(J . U . Kim),이연근(Y . K . Lee),강민식(M . S . Kang),강석형(S . H . Kang) 한국축산학회 1995 한국축산학회지 Vol.37 No.3

This study was performed to offer basic data of both reducing generation interval and improving selection accuracy of dairy cattle for application of parentage test according to analyzing loci of κ-casein and β-lactoglobulin in related Korean dairy cattle using the PCR. The blood samples used in this study were taken from 24 related dairy cattle in Sin-Jung dairy farm and the frozen semen of two straws used in this study were taken from commercial firms. The results obtained were as follows; 1. This study established the extracting method of high quality DNA from the blood samples of 24 related dairy cattle and from two frozen semen samples by using phenol and determined the analyzing method for the polymorphism of κ-casein and β-lactoglobulin using PCR. 2. According to the restricted enzyme digestion in amplified products of κ-casein and β-lactoglobulin using PCR, κ-casein showed AA and AB types, and β-lactoglobulin showed AA, AB, and BB types, respectively. 3. By restricting enzyme digestion, genotypes of κ-caaein and β-lactoglobulin for dairy cows were always derived from genotypes of one parent or both parents. 4. Genetic panems between κ-casein and β-lactoglobulin markers showed independent gene segregations, therefore, in case of being known sire genotypes, genotypes of daughters would be detemuned by probability. 5. For ttte genetic improvement of dairy cattle, if the semen of sire with κ-casein BB or β-lactoglobulin BB were used by the A.I, genotyping method of marker genes can be useful for early identification and selection of dairy calves.

Thoroughbred 경주마의 경주능력에 대한 환경요인의 효과 및 유전분산 (遺傳分散) 추정

박경도,이광전,양영목,최윤석,김재남,김연순 ( K . D . Park,K . J . Lee,Y . M . Yang,Y . S . Choi,J . N . Kim,Y . S . Kim ) 한국축산학회 1992 한국축산학회지 Vol.34 No.1

This study was undertaken using a total of 2,577 racing records of horses from September, 1989 to July, 1990 that collected at the K. H. A. A. (Korean Horse Affairs Association) to investigate effects of environmental factors and to estimate genetic variance for racing performance. Results obtained from this study were as follows. Horse`s age, racing number, track condition and racing season showed significant effects on racing time, and winner`s racing time was not appropriate environmental factor for mean racing time in Korea. Racing performance was the best when horse`s age was 3-4yr, racing number was l situated inside, moisture content was more than 16% in track and racing seasons were spring and winter. Estimates of σ²_e by Maximum Likelihood were smaller than those by Minimum Variance Quadratic Unbiased Estimation (MIVQUE). Adjustment for winner`s racing time reduced estimates of σ²_s, σ²_h, and σ²_e, especially, estimates of σ²_h, which were reduced by an average of about 1000% and estimates of repeatabilities were lower than those of heritabilities. Estimates of heritabilities and repeatabilities by nationality ranged from .13±.17 to .30±.20 and from .36±.07 to .52±.14, respectively. Pooled estimates of heritabilities and repeatabilities were .19±.13 and .42± .06 respectively.

젖소군의 유량생산 수준이 공란우 선발에 미치는 효과

김준식,박경도,정하연,안병석,최유림,이광전 ( J . S . Kim,K . D . Park,H . Y . Jeong,B . S . Ahn,Y . L . Choi,K . J . Lee ) 한국축산학회 1998 한국축산학회지 Vol.40 No.4

The objective of this study was on estimate variance components for milk and fat yields and to examine effect of milk production levels of herds to donor cow selection using a total of 10,264 records of cows(first lactation, 30S-day, mature equivalent) that freshened from 1985 to 1996. Herd groups were classified into low ($lt; 8,150㎏) and high ($gt; 9,100㎏) groups based on the average milk production levels of the herd, and the number of records of the low and high groups were 3,443 and 3,511, respectively. As variance components of the high group were greater than that of the low group, heterogeneity of variance existed in dairy herds. The heritabilities of tow and high groups for milk yield were ranged from 0.155∼0.167 and 0.259∼0.275, respectively. The proportion of selected donor cows in the high producing herds was appeared 4 times as large as in the low producing herds. And there were not significant differences among the models in solving heterogeneity problem between the herds.