종돈의 주요 경제형질에 대한 유전모수 및 유전적 변화 추세 추정에 대한 연구
Estimation of Genetic Parameters and Genetic Trends for Major Economic Traits in Swine
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초록
본 연구에서는 18,668두의 농장 검정된 종돈 자료를 이용하여 유전모수 및 육종가를 추정하였다. 2007년부터 5월부터 2011년 4월까지 영광 소재 N종돈장에서 검정된 Duroc, Berkshire, Landrace 및 Yorkshire종 18,668두에 대한 자료를 근거로 하여 돼지의 주요 경제형질인 90kg 도달일령, 등지방두께 및 등심단면적에 대한 유전력, 유전상관, 표현형상관 및 육종가를 다형질 Animal model을 이용하여 추정하였다. 본 연구에서 추정된 Duroc종에 대한 90kg 도달일령, 등지방두께 및 등심단면적에 대한 유전력은 0.22, 0.62, 0.37로 추정되었으며 Berkshire종의 유전력은 0.52, 0.57 및 0.32로 나타났고 Landrace종의 각 형질의 유전력은 0.26, 0.51 및 0.23이었으며 Yorkshire종의 유전력은 0.29, 0.47 및 0.26을 나타내었다.
Abstract
The objective of this study was to estimate the genetic parameters and breeding value of swine using their economic traits. The traits considered were age at 90 kilograms body weight(D90kg), backfat thickness(BF) and eye muscle area(EMA). Estimation of genetic parameters and breeding value from 18,668 heads considering the economic traits were based on farm performance data from May 2007 to April 2011. Estimation of genetic parameters based on economic traits revealed that the single best model was fitted after finding source of variance on fixed and random effects and estimated by a multiple trait model using DF-REML (Derivative-FREE Restricted Maximum Likelihood). In this study, the estimated heritabilities of Duroc, Berkshire, Landrace and Yorkshire were about 0.22~0.59 for the D90kg, 0.47~0.62 for the BF and 0.23~0.37 for the EMA. Genetic correlation of D90kg with BF and EMA of the four breeds were －0.01~0.24 and －0.35~－0.23, respectively. Moreover, the genetic correlation of BF with EMA was －0.68~－0.17. On the other hand, the phenotypic correlation of D90kg with BF and EMA of the four breeds were about 0.01~0.11 and －0.37~－0.21, respectively, while the phenotypic correlation of BF with EMA was －0.68~－0.17. Results showed that the genetic trends of breeding value every year were decreasing for D90kg, increasing for BF while for EMA inconsistent values were obtained
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