Application of selection for desired changes for improving the ratio-defined character

• Project/Area Number: 18K05934
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 42010:Animal production science-related
• Research Institution: Tohoku University
• Principal Investigator: Satoh Masahiro 東北大学, 農学研究科, 教授 (70370658)
• Project Period (FY): 2018-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2019: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 制限付き選抜 / 比の形質 / 血縁情報 / 正規分布

Outline of Final Research Achievements

This study clarified the relationship between the conventional restricted selection index and the restricted selection index for achieving relative desired changes, which is essential for improving traits such as milk fat percentage and feed requirement ratio, by using linear algebra. I also clarified the selection criterion for achieving the relative desired changes. This enabled the genetic evaluation for selection response to achieve the relative desired changes.

Academic Significance and Societal Importance of the Research Achievements

比の形質とは異なる２形質を分母と分子とする形質であり正規分布をしないため、方向性（育種目標）に向かって改良することが難しい形質である。比の形質は、畜産の現場では乳脂率や飼料要求率など非常に多く用いられている。本研究ではこのような比の形質を改良するための選抜指標および改良手法を明らかにした。これにより、従来の方法よりもより効率的に比の形質を育種改良することが可能となる。

Research Products

• [Journal Article] A method of calculating weighted values for BLUP of breeding values to achieve relative desired changes (2024)
  • Author(s): Masahiro Satoh
  • Journal Title: Animal Science Journal Volume: 95 Issue: 1
  • DOI: 10.1111/asj.13933
  • Peer Reviewed / Open Access
• [Journal Article] Characteristics of restricted selection index and their estimates and geometrical interpretation of restricted breeding values (2024)
  • Author(s): Masahiro Satoh
  • Journal Title: Journal of Animal Breeding and Genetics Volume: 141 Issue: 3 Pages: 353-363
  • DOI: 10.1111/jbg.12845
  • Peer Reviewed / Open Access
• [Journal Article] Comparison of selection responses based on feed conversion ratio and its component traits in pigs (2021)
  • Author(s): 矢崎夏実・上本吉伸・小川伸一郎・佐藤正寛
  • Journal Title: Nihon Chikusan Gakkaiho Volume: 92 Issue: 3 Pages: 279-284
  • DOI: 10.2508/chikusan.92.279
  • NAID: 130008102251
  • ISSN: 1346-907X, 1880-8255
  • Year and Date: 2021-08-25
  • Peer Reviewed / Open Access
• [Journal Article] Responses to selection for maximizing component characters with no change in proportion-defined character : An example of selection for milk fat percentage (2021)
  • Author(s): 矢崎夏実・上本吉伸・小川伸一郎・佐藤正寛
  • Journal Title: Nihon Chikusan Gakkaiho Volume: 92 Issue: 1 Pages: 35-39
  • DOI: 10.2508/chikusan.92.35
  • NAID: 130008021332
  • ISSN: 1346-907X, 1880-8255
  • Year and Date: 2021-02-25
  • Peer Reviewed / Open Access
• [Journal Article] Evaluation criterion for response to selection with constraint (2019)
  • Author(s): Satoh Masahiro
  • Journal Title: Animal Science Journal Volume: 90 Issue: 4 Pages: 462-466
  • DOI: 10.1111/asj.13174
  • Peer Reviewed / Open Access
• [Presentation] Methods to maximize accuracy of selection in maternal genetic model for genetic evaluation of pigs (2023)
  • Author(s): Masahiro Satoh
  • Organizer: 74th Annual Meeting of the European Federation of Animal Science
  • Int'l Joint Research
• [Presentation] 制限付き選抜のための育種価のBLUPに対する重み付け値の算出法とその選抜反応 (2023)
  • Author(s): 佐藤正寛
  • Organizer: 日本畜産学会第131回大会
• [Presentation] 母性遺伝効果を含む形質の選抜法 (2023)
  • Author(s): 佐藤正寛
  • Organizer: 第17回統計遺伝育種研究会
• [Presentation] 制限付き選抜指数とその予測育種価の特性 (2022)
  • Author(s): 佐藤正寛
  • Organizer: 日本畜産学会第130回大会
• [Presentation] 日本におけるブタの閉鎖群育種（系統造成）とその関連研究について (2022)
  • Author(s): 佐藤正寛
  • Organizer: 第４回中国養豚学会
  • Int'l Joint Research / Invited