2021 - 2025 Studies on expressions and roles of INSL3 secretory dynamics and its receptor expression in reproductive organs and germ cells in female cattle
2022 - 2023 ホルスタイン種牛の妊娠期における卵巣予備維持機構
2020 - 2023 Establishment of in vitro culture system of bovine oocyte corresponding to the speed of nuclear maturation for production of the embryo with high implantation ability
2019 - 2022 高泌乳牛の飼養・繁殖管理技術の高度化事業
2018 - 2021 Developing algorithm for estrus detection based on social relationships between cows
2017 - 2020 Elucidation of factors that impair reproductive function and improvement of metabolic function due to subacute rumen acidosis in dairy cows
2017 - 2020 AIを活用した呼吸器病・消化器病・周産期疾病の早期発見技術の開発
2016 - 2020 Induction of placental maturation at induced parturiton in cows
2016 - 2019 Study on the mechanism for diminishing fetal ovarian reserve mediated by maternal testosterone
2014 - 2017 生体センシング技術を活用した次世代精密家畜個体管理システム
2013 - 2016 In vitro growth culture of bovine follicles for developing model of dominant follicle and for application to in vitro production of wildlife oocytes
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Papers (24):
Thomas Chia-Tang Ho, Takashi Tanida, Takashi Fujii, Keisuke Koyama. Extended In Vitro Maturation Enhances Oocyte Developmental Competence but Alters Gene Expression in Bovine Embryos Derived From Oocytes With Slow-Predicted Nuclear Maturation Speed. Molecular reproduction and development. 2025. 92. 11. e70067
Thomas Chia-Tang Ho, Tomoaki Kubo, Akiko Aoki, Yuki Ichikawa, Hideyuki Uruma, Yuka Kawamoto, Yoji Tamura, Shusuke Kojima, Mami Matsuo, Keisuke Koyama. The influence of corpus luteum and first-wave dominant follicle location on conception rate after artificial insemination in Holstein cattle. Animal Science Journal. 2024. 95. 1
Riuru Mizuno, Rin Yamaguchi, Kaoru Matsuura, Ayaha Ishigami, Ryosuke Sakumoto, Ken Sawai, Keisuke Koyama, Michiko Okubo, Kousaku Souma, Hiroki Hirayama. Expression and localization of anti-Müllerian hormone and its receptors in bovine corpus luteum. Theriogenology. 2024. 226. 228-235
Thomas Chia-Tang Ho, Noritoshi Kawate, Keisuke Koyama. Predicting nuclear maturation speed of oocytes from Japanese Black beef heifers through non-invasive observations during IVM: An attempt using machine learning algorithms. Theriogenology. 2023. 209. 235-242
Keisuke Koyama, Tomoaki Kubo, Takeshi Koyama, Yoshiyuki Takahashi. Parity affects the relationship between the insemination-ovulation interval and the conception rate in lactating dairy cows. Reproduction in domestic animals = Zuchthygiene. 2023. 58. 7. 895-902
T. C. Ho, N. Kawate, K. Koyama. 211 Postponed in vitro fertilization timing improves cleavage competence in oocytes with slow-predicted nuclear maturation speed in Japanese Black beef heifers. Reproduction, Fertility and Development. 2023. 36. 2. 261-261
2008/04 - 2013/03 Hokkaido University Graduate School of Veterinary Medicine
2002/04 - 2008/03 Hokkaido University Veterinary Medicine, School of Veterinary Medicine
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Awards (7):
2022/08 - 奨励賞 日本産業動物獣医学会(近畿)
2021/10 - 日本産業動物獣医学会(近畿) 奨励賞
2021/09 - 獣医繁殖学・優秀発表賞 第164回日本獣医学会
2018/10 - 北海道家畜人工授精師協会 優良賞
2018/09 - 北海道獣医師会 北海道獣医師会長賞
2014/10 - 北海道家畜人工授精師協会 統計処理賞
2013/10 - 北海道家畜人工授精師協会 スライド賞
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Association Membership(s) (5):
JAPAN VETERINARY MEDICAL ASSOCIATION
, SOCIETY FOR REPRODUCTION AND DEVELOPMENT
, THE JAPANESE SOCIETY OF VETERINARY SCIENCE
, JAPANESE SOCIETY OF ANIMAL SCIENCE
, Japan Embryo Transfer Society