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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.
가축의 유전적 개량을 위한 지시형질의 이용에 관한 연구 - 젖소를 중심으로 -
이광전(K . J . Lee),정길생(K . S . Jung),한상기(S . K . Han),박홍양(H . Y . Park),양영목(Y . M . Yang),박경도(K . D . Park),박동준(D . J . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.11
This study was carried out with bull calves of high and low breeding value for milk yield, using a pedigree index. At the same time, plasma concentrations of several traits were investigated in order to find out the potential use of indicator traits for the genetic improvement. Results obtained from this study are as follows. 1. Total protein contents of plasma showed significant differences between genetic groups during feeding(P$lt; 0.05), while albumin contents were significantly different during refeeding (P$lt;0.01). Phenotypic correlation between pedigree index and total protein was -0.2111 and this result indicates that further research ias needed for the potential use of indicator traits. 2. Cholesterol concentraions of plasma showed significant differences between genetic groups only during the feeding period, and the content of bull calves with high breeding value was higher than that of lower bull calves. 3. Mean concentrations of glucose were not significantly different between genetic groups of three treatments, while fasting caused a reduction in glucose concentration which increased upon refeeding. 4. Correlation between pedigree index and blood urea nitrogen was -0.0478 and no potential use of indicator traits was found. 5. Concentrations of triglyceride with the high breeding group were lower than those of the low yielding group, and the reversal trend was observed upon refeeding. 6. Phenotypic correlation between total protein and globulin was 0.69. while genetic correlation between cholesterol and triglyceride showed the highest value of 0.97. 7. Heritability and intraclass correlation of cholesterol were estimated as 0.224 and 0.229, respectively. Coheritability of blood urea nitrogen was calculated as -0.03. There was no indication of the potential use of indicator traits.
이광전(K . J . Lee),박경도(K . D . Park),강민식(M . S . Kang),강민구(M . G . Kang),이연근(Y . K . Lee),조광현(K . H . Cho),최재봉(J . B . Choi) 한국축산학회 1993 한국축산학회지 Vol.35 No.6
This study was undertaken to identify the changes of variance components for herd production levels of milk. Milk records were divided into low, medium, and high groups by average herd production, average herd-year production, herd standard deviation, and herd-year standard deviation. Herd standard deviations increased with average herd productions. Correlation between average herd production and herd standard deviation was 0.41, while correlation between average herd-year production and herd-year standard deviation was 0.47. Residual variance components of higher production increased remarkably, while genetic variance components of high group by herd-year standard deviation showed the same increasing trend. When records are transformed to logarithms, however, residual components of variance didn`t show the increasing trend, and the changing ratio decreased markedly without homogeneous variance components. In order to account for the heterogeneity of milk among herds, the optimum classifying criterion was an average herd-year production level. Estimates of heritabilities for low, medium and high groups were 0.185, 0.237, and 0.283, respectively. These results remarkably showed the heterogeneity of milk among dairy herds.
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.
이광전(K . J . Lee),박경도(K . D . Park),양영목(Y . M . Yang),최윤석(Y . S . Choi),안준천(J . C . An),신미영(M . Y . Sin) 한국축산학회 1992 한국축산학회지 Vol.34 No.4
A total of 6,338 racing times of 690 horses was used for this study. Data were repeated racing times of horses that raced at least three times at the 1000m race for a year, 1991 and collected from the Korean Racing Association (K.R.A.). Results obtained were as follows. 1. Investigated percentages of the total variance accounted for by contemporary group, month, day and race were 7.73%, 8.45% and 29.55%, respectively. Ratios ²σ_e/²σ_a and ²σ_e/²σ_p were 3.486 and 10.457, respectively. 2. Animal model used repeated racing times. Estimated breeding values of the horses ranged from -2.44 to +2.65. The regression coefficient and r² of the breeding value on birth-year were 0.04 and 0.001, respectively. Breeding value and permanent environmental effect did not have significant variation among the birth years. 3. The trait that has the highest correlation with estimated breeding values for repeated racing times was the average time. The correlation coefficient between the two traits and estimate of heritability for the average time were 0.86 and 0.41, respectively. 4. Performance index obtained by the multiple regression procedure of the estimated breeding values for the repeated racing times on the other traits was as follows. I = -47.6564 - 0.0193X₁ + 0.6405X₂ + 0.0972X₃ - 0.0047X₄ (r²=0.76) (X₁=best time, X₂=average time, X₃=poorest time, X₄=% races placed 1-2).