요크셔종의 산자수에 대한 통합평가모형에서 농장과 산차간 상호작용 효과
Interaction Effect between Herd and Parity in Integrated Evaluation Model for Litter Size
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초록
본 연구는 3개의 종돈회사가 보유하고 있는 6곳의 GGP 농장에서 분만한 Yorkshire종 의 번식기록을 이용하여 농장과 산차간의 상호작용효과를 구명하는데 있다. 총산자수와 생존산자수의 평균은 각각 13.4±3.6두와 12.5±3.4두였으며, LSO와 LDO의 평균 세대간격은 각각 17.5개월과 22.0개월로 추정되었다. 산차별 총산자수 기록의 분포는 A(10), B(21), C(30) 그룹과 B(20), B(22), C(31) 그룹에서 뚜렷한 차이를 나타내었으며, 농장×산차의 상호작용효과는 고도의 유의차(P < 0.01)가 인정되었다. Model Ⅱ에서 추정된 유전력과 반복력은 총산자수에서 각각 0.13과 0.21, 생존산자수에서 각각 0.11과 0.19로 나타났다. 총산자수의 육종가를 이용하여 선발된 분만 기록이 있는 개체의 top 1% 비율은 ModelⅠ에서 A(10)농장이 67.4%로 가장 높았고 B(20), C(30), B(21)순이었으나, ModelⅡ에서 B(22)농장이 35.8%로 가장 높았고 B(20) 34.7%, B(21) 12.6%순이었다. 총산자수의 육종가를 이용하여 선발된 자손의 기록이 있는 씨수퇘지들의 top 1% 비율은 ModelⅠ에서 A(10)농장이 55.6%로 가장 높았으나 ModelⅡ에서 C(31)농장이 33.3%로 가장 높았고 B(20)과 B(21) 22.2%순이었다.
Abstract
This study was conducted to investigate the interaction effect between farms and parity using the reproductive records of Yorkshire pig from six GGP farms owned by three breeding companies. The means of the TNB and NBA were 13.4±3.6 and 12.5±3.4 heads, respectively. Average generation intervals of the LSO and LDO were estimated to be 17.5 and 22.0 months, respectively. The distribution of TNB records by parity showed distinct differences in two groups as farm code A(10), B(21), C(30) and farm code B(20), B(22), C(31). The interaction effect between parity and farm was found to be highly significant (p < 0.01). The estimates of heritability and repeatability in Model II which additionally considered the interaction effect of parity and farm for TNB were 0.13 & 0.21 and for NBA were 0.11 & 0.19, respectively. The proportion of sows with delivery records that were selected in the top 1% according to the breeding value of TNB estimated in Model I was the highest at 67.4%, in A(10) farms, followed by B(20), C(30) and B(21). However, the proportion was highest in B(22), 35.8%, followed by B(20), 34.7% and B(21), 12.6% in Model II. The proportion of boars with progeny records that were selected in the top 1% according to the breeding value of TNB estimated in Model I was the highest at 55.6% in A(10) farms, however, the proportion was highest in C(31), 33.3%, followed by B(20) & B(21), both 22.2% in Model II.
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