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젖소 産乳能力의 遺傳的 改良을 위한 適正育種規模 推定에 關한 硏究
崔光洙,玄柄和 慶北大學校 1984 農業科學技術硏究所報 Vol.1 No.-
本 硏究는 젖소 産乳能力의 遺傳的 改良量을 增大시키기 위한 最適正 育種規模를 究明하기 위하여 遂行되었다. 젖소 産乳量의 年間 遺傳的 改良量은 育種規模에 크게 影響을 미치는 5個 要因과 各 要因의 水準으로부터 組合되는 10,584個의 경우에 대하여 推定되었는데 5個의 要因은 成牝牛 集團의 크기 ?? 成牝牛 集團中 能力 檢定 事業이 實施되는 比率?? 育種集團中 候補 種牡牛에 의하여 授精되는 比率?? 每年 候補 種牡牛 1頭에 의하여 受胎되어지는 成牝牛 頭數?? 및 能力保證 種牡牛 頭當 年間 精液 生産數量 ?? 으로 얻어진 結果를 要約하면 다음과 같다. 産乳量의 年間 遺傳的 改良量은 ?? 및?? 水準이 높아짐에 따라 增加하였다. 그러나 最大의 遺傳的 改良量은 di=100∼250頭와 ei=20,000인 경우에 나타났다. ?? 育種集團 100,000인 集團에 있어서 産乳量의 遺傳的 改良量의 最大値는 ?? 頭인 경우에 1.65%로 推定되었고 이 경우 後代檢定群의 크기는 24頭이고 每年 50頭의 候補 種牡牛와 8頭의 能力保證 種牡牛 및 375頭의 候補 種牡牛 生産用 種牝牛를 選拔하여야 한다. ?? 頭인 경우 産乳量의 遺傳的 改良量 最大値는 2.14% 이고 後代檢定群의 크기는 47頭이며 每年 151頭의 候補 種牡牛와 7頭의 能力保證 種牡牛 및 1,133頭의 候補種牡牛 生産用 種牝牛를 選拔하여야 한다. ??또는 ??로서 育種集團의 크기가 200,000인 集團에 있어서는 ??頭일때 産乳量의 年間 遺傳的 改良量은 1.76%로 推定되었고 ??頭인경우 産乳量의 年間遺傳的 改良量은 2.21%로 推定되었다. The study was made to find out most optimum breeding structure for increasing genetic gain in milk yield of dairy cattle in Korea. Genetic gain per year in milk yield were estimated in 10,584 cases of breeding structure which were calculated from combining five factors and different levels of each factor. The five factors analyzed in the study were the size of cow population?? the proportion of milk-recorded cows in the population?? the proportion of cows inseminated by young bulls??, the number of cows to be pregnant by a young bull per year??, and the number of semen doses produced from a proven bull per year??. The results obtained are summarized as follows: Genetic gain per year in milk yield increased with the higher levels of ?? and ?? . However, the maximum genetic gain in milk yield was estimated in the cases of ?? heads and?? doses. In the breeding population of 100,000 where ?? and ?? the maximum genetic gain per year in milk yield was estimated as 1.65% at ?? and ?? heads. In this case, the optimum progeny group size was calculated to be 24 heads, and the optimum number of cattle to be selected every year were estimated 50 heads of young bulls, 8 heads of proven bulls and 375 heads of bull-dams. At ?? and ?? heads, the maximum genetic gain per year in milk yield was estimated as 2.14%, the optimum progeny group size was calculated to be 47 heads, and 151 heads of young bulls, 7 heads of proven bulls and 1,133 heads of bull-dams should be selected every year. In the breeding population of 200,000 where ?? or?? the maximum genetic gain per year in milk yield were estimated as 1.76% at ?? and ??heads, and estimated as 2.21% at?? and ?? heads.