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이광전 한국낙농학회 1983 韓國酪農學會誌 Vol.5 No.3
The dairy cattle population in Korea has rapidly increased during the last decade. However, selection for genetic progress should be made to obtain more milk from fewer cows, with fewer kilograms of nutrients consumed from now on. The genetic evaluation of dairy bull is of fundamental importance in genetic progress. To achieve the maximum genetic improvement of dairy cattle, the national sire and cow evaluation program should be started. The need for progeny test of dairy bulls has been discussed. Better fitted evaluation procedures may increase the efficiency of milk production.
젖소 種牡牛 評價에 있어서 遺傳 및 環境的 要因에 關한 考察
이광전,이재영 건국대학교 1973 學術誌 Vol.16 No.2
The Practice of regressing dairy sire proofs for the numbers of daughters included and for the average correlation among those daughters has been gaining wide acceptance in recent years. However, the contributions of environmental and other extraneous correlations to the regression factors being used have been generally neglected. Justification for this has been based larely on the assumption that, when deviation records are used, the effects of these residual correlations in artificial insemination bull proofs are of no practical significance. In several studies with deviation records, the expected correlations of the separate proofs of bulls were computed on the assumption of zero residual correlations among the daughters represented in each proof. The wide discrepancies found between the expected and sample correlations raise some doubts as to the general validity of this assumption.
혼합 모형에 의한 젖소 종모우(種牡牛)의 육종가(育種價) 추정에 관한 연구
이광전,양희성,양영목 한국낙농학회 1988 韓國酪農學會誌 Vol.10 No.3
本 硏究에서 種牡牛의 育種價를 推定하기 위하여 使用된 資料는 1985年 11月부터 1987年 12月까지 京畿, 忠南, 慶南, 慶北, 江原 지역의 21개 牧場에서 搾乳日數 90일 이상의 618頭의 産乳 記錄을 이용하였다. 각 種牡牛의 娘牛數가 10頭 이상인 것만을 分析에 이용하였고, 그 種牡牛의 數는 24頭였다. 모든 記錄은 305日, 2回, 成牛 基準으로 補正을 하였으며, 使用된 補正係數로 USDA-DHIA의 것을 이용하였다. 分析後 얻어진 결과는 아래와 같았다. 1. GLM에 의해 補正한 乳量의 全體平均은 7531.6367㎏이었다. 2. 分析에 사용한 Model 1, 2에서 Model 1의 種牡牛의 分散은 132578.0496이고, Model 2에서의 Genetic Group이 3Group과 8Group인 경우에 150770.7385와 168732.4724였다. 3. Model 1의 Error 分散은 1878482.636이고, Model 2의 경우 1911965.352였다. 4. Model 1과 Model 2의 3Group, 8Group의 遣傳率은 0.26, 0.29, 0.32였다. 5. Model 1에서의 育種價는 -870.909㎏에서부터 +1043.93㎏에 이르기까지 다양하였고, 가장 높은 育種價를 나타낸 種牡牛는 登錄番號 1597697이었다. 6. Model 2에서의 Genetic group이 3Group인 경우에 있어서 H-Y-S의 育種價는 4492.1㎏에서 7930.54㎏까지 다양하였고, 가장 높은 育種價를 나타낸 지역은 京畿 安城이었고 Genetic group에서는 Group 3(미국)이 가장 높았으며, Genetic group 1에서 가장 높은 育種價를 나타낸 種牡牛는 登錄番號 1597697이었다. 7. Model 2에서의 3Group의 경우 全 種牡牛 중 育種價가 가장 높은 登錄番號는 1597697이었다. 8. Model 2에서의 Genetic group이 8Group인 경우에 있어서 H-Y-S의 育種價는 4313.53㎏에서 7745.51㎏까지 다양하였고, 가장 높은 지역은 3Group과 같았으며, Genetic group에서는 미국에서 1974年부터 1975年도 사이에 태어난 種牡牛 group이 가장 높았고 Genetic group 1에서 Group 8까지의 각각 가장 높은 育種價를 나타낸 種牡牛는 登錄番號 10418, 10419, 10353, 311885, 341252, 1597697, 1702698, 1705850이었다. 9. Model 2에서의 8Group의 경우 全 種牡牛 중 育種價가 가장 높은 登錄番號는 1597697이었다. This study was undertaken to estimate the sires' breeding value by mixed model procedures. Lactation records were collected from November, 1985 to December, 1987 on Holstein cows in 21 dairy farms of Kyung-Kee, Chung-Nam, Kyung-Nam, Kyung-Buk and Kang-Won provinces. In total there were 618 records sired by 24 sires, the number of daughters from each sire were more than 10. All records were standardized to 305-days, 2X milking and mature-equivalent by USDA-DHIA correction factors. The results obtained were as follows. 1. The average M.E. milk yield was estimated as 7531.6367kg by GLM procedure. 2. The sire variances were 132578.0496, 150790.7385, 168732.4724 on Model 1, 3 group of Model 2 and 8 group of Model 2, respectively. 3. The error variances were 1878482.636 and 1911965.352 on Model 1 and Model 2 respectively. 4. The heritabilities for milk yield were 0.26, 0.29 and 0.32 on Model 1, 3 group of Model 2 and 8 group of Model 2, respectively. 5. The breeding value of sires evaluated by Model 1 ranged widely from -870.909Kg to +1043.93Kg, the sire of registered number 1597697 was the highest rank. 6. In 3 group of Model 2, the breeding value of H-Y-S ranged widely from 4492.1Kg to 7930.54Kg, Kyung-Kee An-Sung region' and group 3 (U.S.A.) were the highest rank. The sires of registered number 10512, 311885 and 1597697 were the highest rank at genetic group 1, 2 and 3, respectively. 7. The sire of registered number 1597697 was the highest rank at 3 group of Model 2. 8. In 8 group of Model 2, the breeding value of H-Y-S ranged widely from 4313.53Kg to 7745.51Kg. The highest region was equal to 3 group, the sire group of U.S.A.(borned 1974-1975) was the highest rank at genetic group, the sires of registered number 10418, 10419, 10353, 311885, 341252, 1597697, 1702698, 1705850 were the highest rank of the genetic group 1-8, respectively. 9. The sire of registered number 1597697 was the highest rank of the 8 group of Model 2.