HAGIYA Koichi Associate Professor

My DreamDevelop human resources who can contribute to the growth of dairy farming

ThemeStudies on genetic improvement of dairy cattle by statistical genetic approach

Field

Livestock breeding, Population genetics

Keyword

Dairy cattle, Dairy, Genetic improvement

Instructable research topic for doctoral thesis

  • 乳用雌牛の生産能力や生産寿命を遺伝的に改良するための研究
  • 遺伝的能力推定精度向上のための研究
  • 雌牛・雄牛の繁殖能力を遺伝的に改良するための研究
  • 雌牛に対する暑熱ストレスの影響の調査
  • 雌牛の体型的特長と疾病との関係の調査

Message

酪農産業が発展するためには、コストをできるだけ増やさずに牛乳の生産性を高めることが重要です。そのためには、牛舎や搾乳施設の改善、飼料の品質や生産性の向上、遺伝的に優れた乳牛を見つけ出してたくさんの子孫を生産する技術、乳牛の健康を維持する技術など、さまざまな取り組みが必要です。それらの中で、遺伝的に優れた乳牛を正確に見つけ出し、効果的に子孫を生産する仕組みを開発・応用することが私の専門です。

研究室では、乳牛の泌乳記録、体型審査記録、繁殖情報、疾病の記録、血統情報やゲノム情報を使用し、統計解析技術による乳牛改良に関する研究をしています。これらは、乳量、乳脂量、体型的な特徴など、一頭一頭の乳牛からの膨大な記録です。このような情報を解析するためには、コンピュータを使用してデータを処理する必要があります。

家畜育種学の知識と技術は、国内の乳牛改良に関わる産業で必要とされることから、家畜育種学を学んだ先輩の多くが、卒業後、関連機関(ホルスタイン登録協会、家畜改良事業団など)で活躍しています。家畜育種学分野の研究をするためには、特に遺伝学、統計学、コンピュータ科学の知識が重要です。

Academic degree D. Agr.
Room addressGeneral Research Building 1
Mail address hagiya atmark obihiro.ac.jp

Belongs

Research Department/Department of Life and Food Sciences/Division of Animal Production/Section of Life Science

Introduction

Most of the milk in Japan comes from the Holstein breed. Holstein cows have had their milk production increased through genetic improvement. Their reproduction involves artificial insemination, and it's not unusual for genetically superior bulls produce thousands of heifer. Although it's the work of cows to produce milk, the genetic improvement focuses on bulls. The important things are to investigate genetic ability based on individual relationships and genome information so as to find excellent bulls and to digitize their genetic characteristics and convey the correct data to producers. Statistical animal breeding has enabled the development of various methods for analyzing genetic information on individual milk yields, milk constituents, longevity, durability, female fertility, temperament (obedience or nervousness), milking speed, conformation (type) traits, the genetic ability of bulls that are utilized for artificial insemination. The members of our lab have been engaged in much of this research and development. We're trying to do the following: develop a method of breeding cows that can stay healthy even under summer heat stress, produce cows that are suitable for various housing system, such as tie stall, free stall and grazing. Our mission is to develop methods for improving the genetic ability of dairy cows such that they're adapted to the Japanese feeding environment, towards the development of the domestic dairy industry.

Holstein cow

List of current research topics

  • Application of genetic technology to enhance productivity of holstein
  • Studies on improvement of genetic evaluation technology of dairy cattle
  • Development of technology for genetically improving heat stress tolerance of dairy cattle
  • Studies to spread useful information for dairy farmers by investigating appropriate parturition interval and physical features of grazing dairy cattle
Related industries Animal husbandry
Affiliated academic society Japanese Society of Animal Science, Hokkaido Animal Science and Agriculture Society, American Dairy Science Association
Academic background 1993 School of Agriculture and Animal Science, Obihiro University of Agriculture and Veterinary Medicine (graduated)
1998 Graduate School of Agriculture and Animal Husbandry, Obihiro University of Agriculture and Veterinary Medicine (completed master's degree)
2001 the United Graduate School of Agricultural Sciences, Iwate University (completed doctoral degree)
1993-1999 K.K.TOKACHI A.I.CENTER
2001-2003 Hokkaido branch, The Holstein Cattle Association of Japan
2004-2011 National Livestock Breeding Center
2011-2014 Hokkaido Agricultural Research Center, NARO
2015- Associate Professor, Obihiro University of Agriculture and Veterinary Medicine