[논문]임의회귀모형을 이용한 한우 거세우 체중의 유전모수 추정

서강석; 윤두학; 이홍구; 김상훈; 최태정

doi:10.5187/jast.2008.50.2.151

초록
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본 연구는 임의회귀모형을 이용하여 한우 거세우 체중에 대해서 유전모수 추정을 하고 이것을 단형질 개체모형의 결과와 비교해 보고자 실시하였다. 분석에 이용한 자료는 총 1,372두의 한우 거세우의 체중 자료로, 농협중앙회 가축개량사업소에서 실시한 한우 후대검정우의 기록이다. 이차의 임의회귀 모형에 적용한 결과 유전력이 총 800일령까지의 검정기간에 대해 0.17~0.30의 범위로 나타났다. 개체모형을 통해 얻은 유전력은 0.24~0.36의 범위로 나타났다. 측정일간의 영구환경효과의 상관은 검정일령이 늘어남에 따라 함께 증가하는 경향을 보였다. 반면, 측정일간의 유전상관의 경우 검정초기에는 0.30 정도의 약한 음의 상관을 보이지만, 검정이 이뤄짐에 따라 상관이 점차 증가하여 검정이 종료될 무렵이면 거의 고정되는 것으로 나타났다. 임의회귀모형과 개체모형의 결과를 비교해보면 두가지 모형 모두 비슷한 경향을 보여 큰 차이를 보이지 않았다. 따라서, 임의회귀모형을 한우에 대한 국가유전능력평가에 사용하는 것이 가능할 것으로 사료된다.

Abstract ▼ AI-Helper

The study aimed to estimate genetic parameters of body weights in Hanwoo steers using random regression model and compare it with single trait animal model. A total of 1,372 Hanwoo steers that belonged to progeny testing program of the Hanwoo Genetic Improvement conducted at the Livestock Improvemen...

The study aimed to estimate genetic parameters of body weights in Hanwoo steers using random regression model and compare it with single trait animal model. A total of 1,372 Hanwoo steers that belonged to progeny testing program of the Hanwoo Genetic Improvement conducted at the Livestock Improvement Main Center of the National Agricultural Cooperative Federation (LIMC-NACF) in Rep. of Korea were used. Results of the random regression model fitting quadratic function revealed heritability values from 0.17 to 0.30 for the whole testing days up to 800 days. The results of the animal model showed estimated heritability values ranged from 0.24 to 0.36. Estimates of permanent environmental correlations tended to increase with increasing test in days. Unlike in the direct genetic correlation that at early stage the estimate was slightly negative it was 0.30 then increased to approach unity at later stage of test. Comparing the results between random regression model and the animal model showed not much differences and both followed similar pattern and therefore the use of random regression model for the national genetic evaluation of Hanwoo could be implemented.

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제안 방법

All random regression models fitted Legendre polynomials of test in days (tid) as independent variables. It involved fitting a set of regression coefficients on age or functions thereof for each animal as random effects. Orders of polynomial fit up to k = 3 were considered.
Orders of polynomial fit up to k = 3 were considered. The analyses fitted three sets of random regression coefficients due to animal’s direct genetic effects, animal’s permanent environmental effects and due to phenotypic effects. Regression coefficients for phenotypic animal effects were the only one considered.
These weights were treated as separate traits. The purpose of this study was to estimate the genetic parameters of growth in Hanwoo steers using random regression model and eventually compare it with single trait animal model.
The study aimed to estimate genetic parameters of body weights in Hanwoo steers using random regression model and compare it with single trait animal model. A total of 1,372 Hanwoo steers that belonged to progeny testing program of the Hanwoo Genetic Improvement conducted at the Livestock Improvement Main Center of the National Agricultural Cooperative Federation (LIMC-NACF) in Rep.

대상 데이터

The study aimed to estimate genetic parameters of body weights in Hanwoo steers using random regression model and compare it with single trait animal model. A total of 1,372 Hanwoo steers that belonged to progeny testing program of the Hanwoo Genetic Improvement conducted at the Livestock Improvement Main Center of the National Agricultural Cooperative Federation (LIMC-NACF) in Rep. of Korea were used. Results of the random regression model fitting quadratic function revealed heritability values from 0.
A total of 1,372 steers with data from a pedigree of 21,282 animals were used. All the fixed effects fitted were significant (P<0.
Hanwoo progeny testing data from the 23rd up to the 31st progeny testing covering the year 1972 up to 2001 were used. Birth weights were recorded and weighing was undertaken at three, six, twelve, eighteen and twenty two months of age.

이론/모형

Regression coefficients for phenotypic animal effects were the only one considered. The computations were undertaken using DMU package (Madsen and Jensen, 1994).

성능/효과

Estimated heritability slightly decreased during the early stage of test at approximately 180 days then it continuously increased up to about 460 days and slightly decreased and tapered off. Results from using single trait animal model showed estimated heritability at 6, 12, 18 and 22 months were 0.36, 0.24, 0.27 and 0.35, respectively (Table 1). Comparing the results between random regression model and the animal model showed not much differences and both followed similar pattern.
of Korea were used. Results of the random regression model fitting quadratic function revealed heritability values from 0.17 to 0.30 for the whole testing days up to 800 days. The results of the animal model showed estimated heritability values ranged from 0.
05) therefore all (birth year season and birth place) were fitted for both random regression model and single trait animal model. Results of the random regression model revealed during the early stages of test the direct genetic variances slightly decreased up to about 180 days then continuously increased with increasing test in days (Fig. 1).
Estimates of direct genetic, permanent environmental and phenotypic correlations between test in days are shown in Figures 4, 5 and 6. The estimates of additive genetic correlation (Fig. 4) between adjacent test in days exhibited an increasing pattern although at early stage of test at 256 days showed weak 0.09 but as the steers aged it approaches unity. Furthermore, the plot exhibited a smooth surface dominated by large values which formed nearly unity.
30 for the whole testing days up to 800 days. The results of the animal model showed estimated heritability values ranged from 0.24 to 0.36. Estimates of permanent environmental correlations tended to increase with increasing test in days.

참고문헌 (15)

Becker, Walter A. 1984. Manual of quantitative genetics. Academic enterprises, Michigan
BIF. 2002. Guidelines for uniform beef improvement programs. Beef Impov. Fed., Athens, GA
Bullock, K. D., Bertrand, J. K. and Benyshek, L. L. 1993. Genetic and environmental parameters for mature weight and other growth measures in Polled Hereford cattle. J. Anim. Sci. 71:1737- 1741

상세보기
Choi, S. B., Lee, J. W., Kim, N. S., Na, S. H., Keown, J. F. and Van Vleck, L. D. 2000. Estimation of genetic parameters for direct, maternal and grandmaternal genetic effects for birth, weaning and six month weights of Hanwoo (Korean cattle). Asian-Aust. J. Anim. Sci. 13(2) 149

원문보기 상세보기
Han, K. J. 2002. Estimation of genetic parameters for body weights and body measurements of Korean cattle. J. Anim. Sci. & Technol. (Kor) 44(2):201-206

원문보기 상세보기
Jaffrezic, F., Venot, E., Laloe, D., Vinet, A. and Renand, G. 2004. Use of structured antede- pendence models for genetic analysis of growth curves. J. Anim. Sci. 82:3465-3473
Koots, K. R., Gibson, J. P., Smith, C. and Wilton, J. W. 1994. Analyses of published genetic parameter estimates for beef production traits. 1. Heritability. Anim. Breed. Abstr. 62:309-338
Kirkpatrick, M., Lofsvold, D. and Bulmer, M. 1990. Analysis of inheritance, selection and evolution of growth trajectories. Genetics 124:979-993

상세보기
Madsen, P. and Jensen, J. 1994. A user's guide to DMU. Danish Institute of Agricultural Sciences
Meyer, K. 1998. DFREML version 3.0B, Users Notes. Animal Genetics and Breeding Unit, UNE, NSW, Australia
Meyer, K. 2000. Random regressions to model phenotypic variation in monthly weights of Australian beef cows. Livest. Prod. Sci. 65:19-38

상세보기
Meyer, K. 2001. Estimates of direct and maternal functions for growth of Australian beef calves from birth to weaning. Genet. Sel. Evol. 33:487- 514

상세보기
Nobre, P. R. C., Misztal, I., Tsuruta, S., Bertrand, J. K., Silva, L. O. and Lopes, P. S. 2003a. Analyses of growth curves of Nellorecattle by multiple-trait and random regression models. J. Anim. Sci. 81: 918-926

상세보기
Nobre, P. R. C., Misztal, I., Tsuruta, S., Bertrand, J. K., Silva, L. O. and Lopes, P. S. 2003b. Genetic evaluation of growth in Nellore cattle by multiple-trait and random regression models. J. Anim. Sci. 81:927-932

상세보기
SAS. 1991. SAS User's Guide Statistical Analysis System Institute, Cary N.C

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임의회귀모형을 이용한 한우 거세우 체중의 유전모수 추정
Estimation of Genetic Parameters of Body Weights in Hanwoo Steers(Korean Cattle), Bos Taurus Coreanae Using Random Regression Model 원문보기

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임의회귀모형을 이용한 한우 거세우 체중의 유전모수 추정 Estimation of Genetic Parameters of Body Weights in Hanwoo Steers(Korean Cattle), Bos Taurus Coreanae Using Random Regression Model 원문보기

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임의회귀모형을 이용한 한우 거세우 체중의 유전모수 추정
Estimation of Genetic Parameters of Body Weights in Hanwoo Steers(Korean Cattle), Bos Taurus Coreanae Using Random Regression Model 원문보기

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