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한우의 주요 경제형질에 대한 유전모수 추정 2 . Henderson 방법에 3 에 의한 증체형질들에 대한 유전력 및 유전상관 (遺傳相關)
이득환,오봉국,박영일,신언익,양영훈 ( D . H . Lee,B . K . Ohh,Y . I . Park,O . Y . Shin,Y . H . Yang ) 한국축산학회 1991 한국축산학회지 Vol.33 No.7
Heritabilities and genetic correlations were estimated by Henderson`s method 3 on the basis of the data from 867 heads of Korean native cattle tested at Korea Native Cattle Improvement Center. The traits for estimation of genetic parameters were body weights at birth, weaning, yearling. and 18-month of age, and chest girth at yearling age. The heritability estimates were 0.12±0.08 at birth weight, 0.31±0.17 at weaning weight. 0.11±0.08 at gain after weaning, and 0.19±0.07 at yearling weight. The genetic correlation between birth weight and gain after weaning was negatively estimated(-0.60), but that between gain after weaning and yearling weight was positively estimated(0.66).
한우의 주요 경제형질에 대한 유전모수 추정 1 . 체중 및 흉위에 대한 일반능력 및 자료의 분포 특성
이득환,오봉국,박영일,신언익,양영훈 ( D . H . Lee,B . K . Ohh,Y . I . Park,O . Y . Shin,Y . H . Yang ) 한국축산학회 1991 한국축산학회지 Vol.33 No.7
This study was carried out to seek the effects of environmental factors and properties of growth as being based on genetic evaluation of Korean native cattle. Analytic data were collected from 973 heads of male calves tested at Korea Native Cattle Improvement Centre from 1985 to 1988. Body weight at birth, weaning. yearling, and gain from weaning to yearling were affected highly(99.99%) by testing year-season and location at birth but the effects of parity was a little significant for growth traits. As data of chest girth at yearling showed highly skewed distribitions. it might be requested for transformation of data for genetic evaluation.
이득환(D . H . Lee),박철진(C . J . Park),신언익(O . Y . Shin) 한국축산학회 1994 한국축산학회지 Vol.36 No.1
This study was carried out to estimate the effect of age of dam, parity of dam and sex of calf on weaning weight and their corrective factors in Korean Native Cattle (HANWOO). The data for this study were obtained from 3.453 calves weaned between 80 and 200 days of age at Korean Native Cattle Improvement Center from tall. 1985 to spring, 1993. The data were statistically analyzed by the least square method using a linear model. By the results of this study, calves of Hanwoo were weaned at 145 days of age and body weights at that time were estimated by 110㎏ at male and 101㎏ at female. It was estimated that weaning weights of calves were affected to calving age of dam and parity (p$lt;0.001). It was most weighing that calf born at 7 years of age or 6th parity of dam to weaning. It should be appropriated that weaning weight be adjusted by additive correction factor for calving age of dam and sex of calves.
축소개체모형을 이용한 한우의 증체형질에 대한 다형질 평가
이득환 ( D . H . Lee ) 한국축산학회 1992 한국축산학회지 Vol.34 No.1
Best linear unbiased predictors(BLUP) of breeding values for body weights at 18 months of age(18W) as single trait evaluation and those for 3 growth traits as multiple trait evaluation were estimated by indirect solving methods with reduced animal model(RAM) in Korean Native Cattle. Of 1629 animals reared at Korean Native Cattle Improvement Center, only 867 heads had valid records for all analytic traits. Breeding values for 18W could be estimated at 16 rounds of iteration by successive overrelaxation method with 1.4 relaxation factor and 2×10^-4 convergence criteria. In multiple trait evaluation involving birth weight(BW), weaning weight (WW) and postweaning gain(PG) with 2361 of mixed model equations, estimates by 1×10^-4 convergence criteria could be obtained at 29 rounds of iteration, when block iteration method with 1.2 relaxation factor was used, and also approximate prediction error variances could be estimated. The range of breeding values for WW was -37.5∼48.4㎏ and that for PG was -17.9∼16.6㎏ in multiple trait evaluation.
혼합모형식에서 Pseudo - REML 방법을 이용한 유우의 비유형질에 대한 분산성분 및 유전모수 추정
이득환(D . H . Lee),오봉국(B . K . Ohh),신영수(Y . S . Sin),이학교(H . K . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.3
Variance components and genetic parameters for first lactation were estimated using Schaeffer`s Pseudo-REML method in mixed model equation(MME). Variance components were estimated with the data of 596 First lactation records which had been gathered at the National Animal Breeding Institute from 1970 to 1988. Analyzed traits were 305-day milk yield, fat yield and fat percentage. Iteration numbers for estimation were 42, 29, and 31 at milk yield, fat yield and fat percentage in convergence criteria of 1 × 10^-5, respectively. Heritabilities estimated from sire variance components in mixed model equation were 0.333, 0.245, and 0.178 for milk yield, fat yield and fat percentage, respectively. Estimates of genetic correlation were 0.782 between milk yield and fat yield. -0.596 between milk yield and fat percentage. and 0.086 between fat yield and fat percentage.
한우의 증체형질에 있어서 BLUP 에 의한 다형질 종모우 (種牡牛) 평가
이득환 ( D . H . Lee ) 한국축산학회 1992 한국축산학회지 Vol.34 No.1
Single- and multiple-trait sire evaluations were carried out on the basis of the data collected from 861 heads of male calves of Korean Native Cattle(HANWOO) tested at Korean Native Cattle Improvement Center from 1985 to 1988. Comparison was made between the best linear unbiased predictors with relationship and those without relationship of the single- and multiple-trait evaluation in sire mixed model. The range of the best linear unbiased predictors without relationship was wider than that with relationship in single-trait evaluation and predictors of sire`s genetic effects in multiple-trait evaluation with relationship showed the larger variety than those in single-trait evaluation with relationship. The range of the best linear unbiased predictors for weaning weight was -5.30∼10.28㎏ and that for postweaning gain was -5.05∼ 2.61㎏ in multiple-trait sire mixed model with relationship.
한우의 종모우 평가방법에 관한 연구 2 . 선발지수법과 BLUP 에 의한 단형질 및 다형질 평가방법의 비교
이득환(D . H . Lee),이문걸(M . G . Lee),신언익(O . Y . Shin) 한국축산학회 1991 한국축산학회지 Vol.33 No.12
As a fundametal study of the sire evaluation method for simultaneous improvement of growth and carcass traits of Korean native Cattle (HANWOO). best linear unbiased predictors (BLUPs) by multitrait evaluation were compared with BLUPs by single trait evaluation and index values by selection index equation. Data on 510 male calves obtained from Korean Native Cattle Improvement Center were used for sire evaluation BLUPs for expected progeny differences in single trait evaluation with mixed model ranged -9.79∼12.91 ㎏ at body weight at 6 months of age(BW6), -31∼42 g/day at average daily gain(ADG), -0.87∼0.63% at retail cuts (RC) and -0.61∼0.85 score at marbling score(MS). The selection index equation estimated by BW6, ADG, MS was: BW6 + 85.18ADG + 4.93MS. BLUPs in multitrait evaluation were estimated wider ranges than those in single trait evaluation. In ,ire evaluation method, simulaneously considered BW6. ADG and MS. sire ranks by multitrait evaluation were positively correlated with those be selection index (0.94).
제한최대우도법 (制限最大尤度法) 을 이용한 한우의 증체형질에 대한 분산성분 추정
이득환(D . H . Lee),신언익(O . Y . Shin) 한국축산학회 1991 한국축산학회지 Vol.33 No.12
Restricted maximum likelihood estimates of genetic parameters of growth traits were examined in Korean Native Cattle(HANWOO) and compared with estimates of parameters by Henderson`s method 3. Analytic data were collected from 972 heads of purebred of HANWOO tested at Korean Native Cattle Improvement Centre from 1985 to 1988. Sire and error variances were estimated according to a mixed model that included fixed year-season, location at birth, parity and random sire and error variances. Sire variances by restricted maximum likelihood were estimated higher than those by Henderson`s method 3 and error variances by restricted maximum likelihood were, on the other hand, estimated lower than those by Henderson`s method 3 in most of the growth traits. A large number of iterations were required for variance component estimation by restricted maximum likelihood but if a good initial value would be used the number of iteration could be reduced.
축소개체모형에서 가기대법을 이용한 한우의 증체형질에 대한 분산성분 추정
이득환 ( D . H . Lee ) 한국축산학회 1991 한국축산학회지 Vol.33 No.10
Variance components for growth traits of Korean Native Cattle were estimated by a pseudoexpectation method in the reduced animal model. This method was quickly converged to estimates of variance components for growth traits of Korean Native Cattle. There were a little differences between estimates of variance com ponents by the pseudoexpectation method in the reduced animal model and those by the restricted maximum likelihood in the sire mixed model.