랜드레이스와 요크셔종의 생시체중, 복당생시체중변이와 산자수에 대한 유전모수 추정
Estimation of Genetic Parameters for Birth Weight, within Litter Variation of Birth Weight and Litter Size in Landrace and Yorkshire Pigs
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본 연구는 6개 핵돈군생산농장(Great grand parents, GGP)에서 2015년 이후 태어난 Landrace종과 Yorkshire종의 두 품종에 대하여 생시체중(Birth weight; BW), 복당평균생시체중(Mean of litter birth weight; MBW0)과 변이계수(Coefficient of variation in MBW0; CVMBW0) 및산자수(Litter size) 등에 대한 유전모수를 추정하였다. Landrace종에서 총산자수(Total number of piglets born; TNB), 생존산자수(Number of piglets born alive: NBA), 복당평균생시체중 및 복당평균생시체중 변이계수의 유전력은 각각 0.14, 0.09, 0.33 및 0.16. Yorkshire종에서는각각 0.11, 0.99, 0.28 및 0.07로 추정되었다. 산자수와 복당평균생시체중 간에는 부(-)의 상관관계를 나타내었으며, 복당평균생시체중과 변이계수사이의 표현형상관과 유전상관이 두 품종에서 모두 –0.40에서 –0.45로 높게 나타났다. 자돈 생시체중에 대한 균일도를 개량하기 위해서는 복당평균생시체중(MBW0)과 복당평균생시체중변이계수(CVMBW0)를 선발지수식에 포함시키는 것이 바람직하다고 생각된다.
Abstract
For 2 pig breeds (Landrace and Yorkshire) produced from 6 GGP (Great grand parents) farms after 2015, genetic parameters including birth weight (BW), mean of litter birth weight (MBW0), coefficient of variation in MBW0 (CVMBW0) and litter size were estimated. The estimated heritabilities estimates for the total number of piglets born (TNB), the number of piglets born alive (NBA), gestation period (GP), MBW0 and CVMBW0 were 0.14, 0.09, 0.39, 0.33, and 0.16, respectively for Landrace, while those were 0.11, 0.99, 0.36, 0.28, and 0.07, respectively for Yorkshire. The litter size and MBW0 were negatively correlated, and the estimates for the phenotypic and genetic correlation coefficients between MBW0 and CVMBW0 were high and in the range of –0.40 and –0.45 in both breeds. It would be desirable to include MBW0 and CVMBW0 to the selection index for the improvement of the degree of uniformity of piglet birth weight.
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