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Effectiveness of strain in maintaining long-term genetic diversity of Tajima cattle

Research Project

Project/Area Number 17K08045
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Animal production science
Research InstitutionKobe University

Principal Investigator

Oyama Kenji  神戸大学, 農学研究科, 教授 (70322203)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords黒毛和種 / 遺伝的多様性 / 系統分類 / 和牛 / 但馬牛 / 近交係数 / シミュレ-ション / 集団の有効サイズ / シミュレーション / 畜産学
Outline of Final Research Achievements

Genetic diversity of Japanese Black cattle is rapidly decreasing in exchange for significant genetic improvement. In this study, we investigated the long-term effectiveness of the systematic strain classification actually adopted in Tajima cattle that does not allow gene introduction from the outside. Computer simulations of Tajima cattle up to 15 generations ahead (approximately 150 years ahead) showed that continued within-strain mating promoted gene homogenization and reduced genetic diversity attributed to within-strain, but it became clear that the genetic diversity among strains can be maintained greatly.

Academic Significance and Societal Importance of the Research Achievements

系統分類の継続による遺伝的多様性の推移、とくに実在の集団を材料としてコンピュータシミュレーションした報告は皆無である。また、短期的にはその有効性が確認されていたものの、本研究では但馬牛に採用されている系統分類手法の長期的な有効性が確認され、現実集団における本手法の適用の正当性を示すこととなる。ただし、設定した5つの系統のうち、15世代先までの維持が難しい系統も明らかとなり、系統の特徴を強めてゆく新たな方策が求められる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (1 results)

All 2019

All Presentation (1 results)

  • [Presentation] 但馬牛の系統分類が長期的な遺伝的多様性に与える効果2019

    • Author(s)
      山田 栞,本多 健,小浜菜美子,坂瀬充洋,大山憲二
    • Organizer
      日本畜産学会第126回大会
    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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