두록 품종에서 잔류사료섭취량의 유전모수 추정
Estimation of Genetic Parameters for Residual feed intake in Duroc pigs
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초록
사료이용 측면에서 유지 및 성장에 필요한 섭취량과 체내에 이용되지 않은 섭취량으로 구분할 수 있으며, 체내에 이용되지 않은 섭취량을 잔류사료섭취량(Residual Feed Intake; RFI)이라 한다. 본 실험은 국내 종돈의 RFI 유전모수를 추정하기 위해 2001년부터 2014년까지 태어난 Duroc종 8,696두의 검정자료를 활용하였다. 일당증체량과 RFI의 육종가 상관관계는 -0.2로 음의 상관으로 조사되었는데(P>0.01), RFI를 낮추면 일당증체량 개량에도 긍정적인 영향을 줄 수 있는 것으로 사료된다. 회귀추정방식에 따른 RFI1(일당증체량)과 RFI2(일당증체량, 등지방두께)의 유전력은 각각 0.37, 0.45로 고도의유전력을 나타내었다. 향후 국내에서도 개체단위 사료섭취량 측정으로 추정된 RFI를 개량에 활용한다면농가 수익 개선에 많은 도움을 줄 수 있을 것으로 판단된다.
Abstract
Residual feed intake(RFI), a linear index, is a trait derived from the difference between actualfeed intake and that predicted on the basis of the requirements for maintenance of body weightand production. This study was conducted to estimate RFI genetic parameters of swine inKorea, and used 8,696 of productions data of Duroc swine species which were born from 2001to 2014. Correlation between average daily gain and RFI breeding value has been investigatedby negative correlation of –0.2(P>0.01). Estimates of heritability for RFI1(residual feed intakecalculated from model average dily gain) and RFI2(residual feed intake calculated from modelaverage dily gain and backfat) were 0.37 and 0.45. From the genetic parameter estimates foundin this study, selection for low RFI in Duroc pigs has the potential to improve feed conversionratio and reduce feed intake.
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