한우 도체형질의 유전능력 평가에 영향을 미치는 성의 효과
Gender Effect on the Genetic Evaluation of Hanwoo Carcass Traits
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본 연구는 한우 도체형질에서 거세우 자료로 실시한 유전능력 평가결과가 암소 자료로 실시한 평가결과와 차이가 있는지를 알아보기 위해서 도축 자료를 암소 자료와 거세우 자료로 분리해서 유전모수와육종가를 추정함과 동시에 동일 형질의 암소 측정치와 거세우 측정치를 각각 다른 형질로 간주하고 각형질 내에서 두 측정치간의 유전 상관계수를 추정하였다. 도체중, 등지방 두께, 등심 단면적 및 근내지방도의 유전력은 암소 자료 추정치들이 각각 0.60, 0.46, 0.47 및 0.59 그리고 거세우 자료 추정치들이 각각 0.62, 0.54, 0.41 및 0.58로 도체중과 근내지방도에서는 두 자료의 추정치 간 차이가 없었으나등지방 두께 유전력은 암소자료 추정치가 거세우 자료 추정치에 비해 8% 더 작고 등심 단면적 유전력은 암소자료 추정치가 6% 더 큰 것으로 나타났다. 그리고 같은 형질 내에서 추정한 암소 측정치와 거세우 측정치간의 유전 상관계수는 도체중이 0.77, 등지방 두께가 0.79, 등심 단면적이 0.79, 그리고 근내지방도가 0.87이었다. 한편 각 형질별로 계산한 암소 자료의 추정 육종가와 거세우 자료의 추정 육종가간 순위 상관계수는 도축우 아비들이 0.45(도체중)에서 0.65(근내지방도)의 범위, 그리고 도축우 어미들이 0.29(도체중)에서 0.40(근내지방도)의 범위로 낮은 편이었다. 이러한 결과는 추정된 자료에 따라 씨수소나 씨암소의 선발 순위가 달라질 가능성이 있음을 시사한다.
Abstract
The objectives of this study were; 1) to compare the differences in genetic parameters andbreeding values for carcass weight (CWT), back fat thickness (BFT), eye-muscle-area (EMA),and marbling score (MAR) when they were estimated using whole data set or using subsets ofdata splitted by gender (cow or steer data), and 2) to estimate the genetic correlationcoefficients between measurements of cow and steer within a same carcass traits in Hanwoo. Heritability estimates of CWT, BFT, EMA and MAR on cow data were 0.60, 0.46, 0.47 and0.59, respectively. Corresponding estimates on steer data were 0.62, 0.54, 0.41 and 0.58,respectively. Heritability estimates of CWT and BFT were showed no clear difference betweencow and steer data set. However heritability estimate of BFT and EMA on cow data weresmaller by 8% and larger by 6%, respectively, than those on steer data. Genetic correlationcoefficients of cow measurement with steer measurement within a trait were 0.77 for CWT,0.79 for BFT, 0.79 for EMA and 0.87 for MAR, respectively. Rank correlation coefficients between breeding values estimated from cow and steer data within a trait tended to be low,ranging 0.45 (CWT) to 0.65 (MAR) in sire, and 0.29 (CWT) to 0.40 (MAR) in dam. Theseresults suggest that parental breeding values for carcass traits might be changed on the dataused for genetic evaluation.
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