본 연구는 근친이 한우의 경제형질에 미치는 영향을 알아보기 위하여 2017년 3월까지의 육종농가에서 사육되었던 전체 개체자료와 후대검정우 36∼62차 개체자료를 한우개량사업소(농협중앙회)에서 제공받아 분석하였다. 육종농가의 98농가 90,800두의 개체자료와 후대검정우 5,544두였으며, 번식기록이 있는 27,196두의 암소의 번식자료는 98,429건이었다. 본 연구에 사용한 대상은 친자확인이 이루어진 육종농가 개체와 후대검정우 개체를 합하여 44,845두였으며, 번식 기록이 있는 암소 20,109두의 59,986건을 번식 자료로 사용하였다. 혈통정보는 종축개량협회에서 제공한 64,175두를 사용하였다. 1. 전체집단에서 혈통완성도는 84.87%였으며, 부모세대, 조부모세대, 증조부모세대는 각각 93.82%, 88.35%, 80.89%로 나타났으며, 친자확인집단에서는 76.72%이며, 99.88%, 77.67%, 70.79%로 나타났다. 근교계수의 경우 전체집단의 경우 년도별 0.144∼1.050%로 평균 0.728%, 친자확인집단의 경우 0.038∼0.534%로 평균 0.410%로 나타났다. 2. 세대간격은 수컷송아지-아비, 수컷송아지-어미, 암컷송아지-아비, 암컷송아지-어미 각각 6.938년, 3.932년, 5.232년, 4.174년으로 나타났으며, 부모별 아비는 6.085년, 어미는 4.053년, 성별 수컷송아지는 5.435년 암컷송아지 4.703년으로 나타났다. 세대간격은 5.069년으로 나타났으며, 친자확인 집단의 유효집단 크기는 496두로 나타났다. 3. 근교계수 ...
본 연구는 근친이 한우의 경제형질에 미치는 영향을 알아보기 위하여 2017년 3월까지의 육종농가에서 사육되었던 전체 개체자료와 후대검정우 36∼62차 개체자료를 한우개량사업소(농협중앙회)에서 제공받아 분석하였다. 육종농가의 98농가 90,800두의 개체자료와 후대검정우 5,544두였으며, 번식기록이 있는 27,196두의 암소의 번식자료는 98,429건이었다. 본 연구에 사용한 대상은 친자확인이 이루어진 육종농가 개체와 후대검정우 개체를 합하여 44,845두였으며, 번식 기록이 있는 암소 20,109두의 59,986건을 번식 자료로 사용하였다. 혈통정보는 종축개량협회에서 제공한 64,175두를 사용하였다. 1. 전체집단에서 혈통완성도는 84.87%였으며, 부모세대, 조부모세대, 증조부모세대는 각각 93.82%, 88.35%, 80.89%로 나타났으며, 친자확인집단에서는 76.72%이며, 99.88%, 77.67%, 70.79%로 나타났다. 근교계수의 경우 전체집단의 경우 년도별 0.144∼1.050%로 평균 0.728%, 친자확인집단의 경우 0.038∼0.534%로 평균 0.410%로 나타났다. 2. 세대간격은 수컷송아지-아비, 수컷송아지-어미, 암컷송아지-아비, 암컷송아지-어미 각각 6.938년, 3.932년, 5.232년, 4.174년으로 나타났으며, 부모별 아비는 6.085년, 어미는 4.053년, 성별 수컷송아지는 5.435년 암컷송아지 4.703년으로 나타났다. 세대간격은 5.069년으로 나타났으며, 친자확인 집단의 유효집단 크기는 496두로 나타났다. 3. 근교계수 공변이, 근교계수집단 고정효과의 환경요인효과 결과 근교계수가 공변이일 경우 번식형질 중 초종부일령과 초산일령과 도체 형질에서는 모든 형질이 체중에서는 생시체중과 3개월체중에서만 유의성이 나타났으며, 근교그룹에서는 도체형질과 3개월체중, 6개월체중에서 유의성을 나타내었다. 4. 번식형질 중 유전력은, 초종부일령, 초임일령, 초산일령, 분만 후 초종부일령, 공태일수, 분만간격, 임신기간, 임신 소요 수정회수에서 각각 0.0287, 0.0300, 0.0368, 0.0299, 0.0245, 0.0254, 0.1130, 0.0115로 추정되었고, 반복력은 분만후 초종부일, 공태일수, 번식간격, 임신기간, 수정횟수에서 각각 0.0375, 0.0359, 0.0352, 0.1461, 0.0298로 나타났다. 체중에서는 생시체중, 3, 6, 9, 12, 15, 18, 21, 24개월 체중에서는 각각 0.5525, 0.5238, 0.6201, 0.4882, 0.6142, 0.1722, 0.3818, 0.4529, 0.3802였으며, 도체형질에서는 등지방두께, 배최장근단면적, 도체중, 근내지방도에서 각각, 0.4818, 0.4502, 0.5386, 0.5856으로 추정되었다. 5. 유전 및 표현형상관은 도체, 체형의 모든 형질에서 정의 상관이였으며, 번식은 표현형상관에서 수정횟수와 초종부일령, 분만후 초종부일령, 임 신간격에서 임신간격과 분만후 초종부일령, 공태일수에서 부의 상관이였 고, 유전상관의 경우 임신간격과 분만후 초종부일령, 공태일수 부의 상 관, 수정횟수에서 전 형질이 부의 상관을 나타내었다. 6. 표현형의 근친되지 않은 집단과 근친된 집단의 t-검정결과 번식에서 분만후 초종부일령과 체중의 9, 15개월체중을 제외한 모든 형질에서 통계적 유의성을 나타내었다. 7. 근교계수가 1% 증가함으로 초종부일령은 0.734일 초산일령은 0.602일 증가하였고, 등지방두께, 배최장근단면적, 도체중, 근내지방도에서 각각 -0.217mm, -0.263㎠, -2.390kg, -0.046점, 생시체중과 3개월체중은 0.035일, -0.414일령으로 영향을 미치는 것으로 나타내었다.
본 연구는 근친이 한우의 경제형질에 미치는 영향을 알아보기 위하여 2017년 3월까지의 육종농가에서 사육되었던 전체 개체자료와 후대검정우 36∼62차 개체자료를 한우개량사업소(농협중앙회)에서 제공받아 분석하였다. 육종농가의 98농가 90,800두의 개체자료와 후대검정우 5,544두였으며, 번식기록이 있는 27,196두의 암소의 번식자료는 98,429건이었다. 본 연구에 사용한 대상은 친자확인이 이루어진 육종농가 개체와 후대검정우 개체를 합하여 44,845두였으며, 번식 기록이 있는 암소 20,109두의 59,986건을 번식 자료로 사용하였다. 혈통정보는 종축개량협회에서 제공한 64,175두를 사용하였다. 1. 전체집단에서 혈통완성도는 84.87%였으며, 부모세대, 조부모세대, 증조부모세대는 각각 93.82%, 88.35%, 80.89%로 나타났으며, 친자확인집단에서는 76.72%이며, 99.88%, 77.67%, 70.79%로 나타났다. 근교계수의 경우 전체집단의 경우 년도별 0.144∼1.050%로 평균 0.728%, 친자확인집단의 경우 0.038∼0.534%로 평균 0.410%로 나타났다. 2. 세대간격은 수컷송아지-아비, 수컷송아지-어미, 암컷송아지-아비, 암컷송아지-어미 각각 6.938년, 3.932년, 5.232년, 4.174년으로 나타났으며, 부모별 아비는 6.085년, 어미는 4.053년, 성별 수컷송아지는 5.435년 암컷송아지 4.703년으로 나타났다. 세대간격은 5.069년으로 나타났으며, 친자확인 집단의 유효집단 크기는 496두로 나타났다. 3. 근교계수 공변이, 근교계수집단 고정효과의 환경요인효과 결과 근교계수가 공변이일 경우 번식형질 중 초종부일령과 초산일령과 도체 형질에서는 모든 형질이 체중에서는 생시체중과 3개월체중에서만 유의성이 나타났으며, 근교그룹에서는 도체형질과 3개월체중, 6개월체중에서 유의성을 나타내었다. 4. 번식형질 중 유전력은, 초종부일령, 초임일령, 초산일령, 분만 후 초종부일령, 공태일수, 분만간격, 임신기간, 임신 소요 수정회수에서 각각 0.0287, 0.0300, 0.0368, 0.0299, 0.0245, 0.0254, 0.1130, 0.0115로 추정되었고, 반복력은 분만후 초종부일, 공태일수, 번식간격, 임신기간, 수정횟수에서 각각 0.0375, 0.0359, 0.0352, 0.1461, 0.0298로 나타났다. 체중에서는 생시체중, 3, 6, 9, 12, 15, 18, 21, 24개월 체중에서는 각각 0.5525, 0.5238, 0.6201, 0.4882, 0.6142, 0.1722, 0.3818, 0.4529, 0.3802였으며, 도체형질에서는 등지방두께, 배최장근단면적, 도체중, 근내지방도에서 각각, 0.4818, 0.4502, 0.5386, 0.5856으로 추정되었다. 5. 유전 및 표현형상관은 도체, 체형의 모든 형질에서 정의 상관이였으며, 번식은 표현형상관에서 수정횟수와 초종부일령, 분만후 초종부일령, 임 신간격에서 임신간격과 분만후 초종부일령, 공태일수에서 부의 상관이였 고, 유전상관의 경우 임신간격과 분만후 초종부일령, 공태일수 부의 상 관, 수정횟수에서 전 형질이 부의 상관을 나타내었다. 6. 표현형의 근친되지 않은 집단과 근친된 집단의 t-검정결과 번식에서 분만후 초종부일령과 체중의 9, 15개월체중을 제외한 모든 형질에서 통계적 유의성을 나타내었다. 7. 근교계수가 1% 증가함으로 초종부일령은 0.734일 초산일령은 0.602일 증가하였고, 등지방두께, 배최장근단면적, 도체중, 근내지방도에서 각각 -0.217mm, -0.263㎠, -2.390kg, -0.046점, 생시체중과 3개월체중은 0.035일, -0.414일령으로 영향을 미치는 것으로 나타내었다.
The objectives of this study were to evaluate the effects of inbreeding and to estimate the genetic parameters for economic traits in Hanwoo cattle. Data until March 2017 from 90,800 heads were collected by National Agricultural Cooperative Federation from 98 farms. Reproductive records were 98,...
The objectives of this study were to evaluate the effects of inbreeding and to estimate the genetic parameters for economic traits in Hanwoo cattle. Data until March 2017 from 90,800 heads were collected by National Agricultural Cooperative Federation from 98 farms. Reproductive records were 98,429 from 27,196 dams. Progeny test ranging from 36 to 62 test were conducted to 5,544 heads for body weight and carcass traits. After editing the data, 44,845 heads with confirmed pedigree with body weight at carcass traits were used in the analysis. Reproductive data from 20,109 dams with a total of 59,986 records were also used. Total paternal pedigree data were consist of 64,175 heads from Korea Animal Improvement Association. 1. The results showed that the average level of pedigree completeness was 84.87% in the whole group, and those of parents, grandparents, and great-grandparents were 93.82%, 88.35% and 80.89%, respectively. The average level of pedigree completeness was 76.72% in the known parents group, and those of parents, grandparents, and great-grandparents were 99.88%, 77.67%, and 70.79%, respectively. In the case of inbreeding coefficient, average inbreeding coefficient was 0.728% in the whole group ranging from 0.144∼0.728%. Average inbreeding coefficient was 0.410% in the known parents group ranging from 0.038~0.534%. 2. The generation intervals for male calf-sow, male calf-dam, female calf-sow, female calf-dam relations were 6.938, 3.932, 5.232, 4.174 years, respectively. Average generation intervals for bulls and dams were 6.085 and 4.053 years, respectively. The corresponding generation interval for male and female calves were 5.435 and 4.703 years, respectively. The average generation interval was 5.069 year. The effective group size of known parents was 496 heads. 3. There was significant difference in age at first service and age at first calving of reproductive traits using inbreeding coefficient as covariate and inbreeding group as fixed effects and environmental effects. All the carcass traits showed significant differences. For the body weights, only birth weight and weight at 3 month showed significance. In the inbreeding group, the carcass traits, weight at 3 month and weight at 6 month showed significance. 4. Heritabilities for reproductive traits were 0.0287, 0.0300, 0.0368, 0.0299, 0.0245, 0.0254, 0.1130 and 0.0115 for age at first service, age at first conception, age at first calving, days at first services postpartum, days open, caving interval, gestation length and number of services, respectively. Repeatabilities were 0.0375, 0.0359, 0.0352, 0.1461 and 0.0298 for age at service after parturition, days open, calving interval, gestation length and number of services, respectively. Heritabilities for body weights were 0.5525, 0.5238, 0.6201, 0.4882, 0.6142, 0.1722, 0.3818, 0.4529 and 0.3802 for birth weight, weight at 3 month, 6 month, 9 month, 12 month, 15 month, 18 month, 21 month and 24 month, respectively. Heritabilities for carcass traits were 0.4818, 0.4502, 0.5386 and 0.5856 for backfat thickness, eye muscle area, carcass weight and marbling score, respectively. 5. Genetic and phenotypic correlation analysis showed positive correlation among all traits of carcass and body weights. Phenotypic correlation analysis in reproductive traits showed that there were negative correlation between the number of service and age at first service, between number of service and days at first service postpartum, between calving interval and days at first service postpartum, between calving interval and days open. In the case of genetic correlation, number of service were negatively correlated to gestation length, age at first service, days at first service postpartum, and days open. 6. The results of t-test between inbred and non-inbred group showed statistical significance in all reproductive traits except for age at service after parturition, weight at 9 month and weight at 15 month. 7. Regression analysis showed that when there is 1% increase in inbreeding coefficient there will be increase in age at first service of 0.734 day while 0.602 day for age at first calving. In the same condition, backfat thickness, eye muscle area, carcass weight and marbling score will be decreased to 0.217 mm, 0.263 ㎠, 2.390 kg and 0.046 points, respectively. In body weights, inbreeding coefficient have effects of 0.035kg and –0.414kg in birth weight and weight at 3 month, respectively.
The objectives of this study were to evaluate the effects of inbreeding and to estimate the genetic parameters for economic traits in Hanwoo cattle. Data until March 2017 from 90,800 heads were collected by National Agricultural Cooperative Federation from 98 farms. Reproductive records were 98,429 from 27,196 dams. Progeny test ranging from 36 to 62 test were conducted to 5,544 heads for body weight and carcass traits. After editing the data, 44,845 heads with confirmed pedigree with body weight at carcass traits were used in the analysis. Reproductive data from 20,109 dams with a total of 59,986 records were also used. Total paternal pedigree data were consist of 64,175 heads from Korea Animal Improvement Association. 1. The results showed that the average level of pedigree completeness was 84.87% in the whole group, and those of parents, grandparents, and great-grandparents were 93.82%, 88.35% and 80.89%, respectively. The average level of pedigree completeness was 76.72% in the known parents group, and those of parents, grandparents, and great-grandparents were 99.88%, 77.67%, and 70.79%, respectively. In the case of inbreeding coefficient, average inbreeding coefficient was 0.728% in the whole group ranging from 0.144∼0.728%. Average inbreeding coefficient was 0.410% in the known parents group ranging from 0.038~0.534%. 2. The generation intervals for male calf-sow, male calf-dam, female calf-sow, female calf-dam relations were 6.938, 3.932, 5.232, 4.174 years, respectively. Average generation intervals for bulls and dams were 6.085 and 4.053 years, respectively. The corresponding generation interval for male and female calves were 5.435 and 4.703 years, respectively. The average generation interval was 5.069 year. The effective group size of known parents was 496 heads. 3. There was significant difference in age at first service and age at first calving of reproductive traits using inbreeding coefficient as covariate and inbreeding group as fixed effects and environmental effects. All the carcass traits showed significant differences. For the body weights, only birth weight and weight at 3 month showed significance. In the inbreeding group, the carcass traits, weight at 3 month and weight at 6 month showed significance. 4. Heritabilities for reproductive traits were 0.0287, 0.0300, 0.0368, 0.0299, 0.0245, 0.0254, 0.1130 and 0.0115 for age at first service, age at first conception, age at first calving, days at first services postpartum, days open, caving interval, gestation length and number of services, respectively. Repeatabilities were 0.0375, 0.0359, 0.0352, 0.1461 and 0.0298 for age at service after parturition, days open, calving interval, gestation length and number of services, respectively. Heritabilities for body weights were 0.5525, 0.5238, 0.6201, 0.4882, 0.6142, 0.1722, 0.3818, 0.4529 and 0.3802 for birth weight, weight at 3 month, 6 month, 9 month, 12 month, 15 month, 18 month, 21 month and 24 month, respectively. Heritabilities for carcass traits were 0.4818, 0.4502, 0.5386 and 0.5856 for backfat thickness, eye muscle area, carcass weight and marbling score, respectively. 5. Genetic and phenotypic correlation analysis showed positive correlation among all traits of carcass and body weights. Phenotypic correlation analysis in reproductive traits showed that there were negative correlation between the number of service and age at first service, between number of service and days at first service postpartum, between calving interval and days at first service postpartum, between calving interval and days open. In the case of genetic correlation, number of service were negatively correlated to gestation length, age at first service, days at first service postpartum, and days open. 6. The results of t-test between inbred and non-inbred group showed statistical significance in all reproductive traits except for age at service after parturition, weight at 9 month and weight at 15 month. 7. Regression analysis showed that when there is 1% increase in inbreeding coefficient there will be increase in age at first service of 0.734 day while 0.602 day for age at first calving. In the same condition, backfat thickness, eye muscle area, carcass weight and marbling score will be decreased to 0.217 mm, 0.263 ㎠, 2.390 kg and 0.046 points, respectively. In body weights, inbreeding coefficient have effects of 0.035kg and –0.414kg in birth weight and weight at 3 month, respectively.
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