Akira Yamanobe
Japan Racing Association
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Featured researches published by Akira Yamanobe.
Journal of Equine Science | 2015
Hirotoshi Mizukami; Tsuyoshi Suzuki; Yasuo Nambo; Mutsuki Ishimaru; Hiroshi Naito; Kenji Korosue; Kentaro Akiyama; Kenji Miyata; Akira Yamanobe; Kentaro Nagaoka; Gen Watanabe; Kazuyoshi Taya
ABSTRACT Development and endocrine changes in Thoroughbreds colts and fillies were compared between those reared at two facilities of the Japan Racing Association, the Hidaka Training and Research Center (Hidaka) and Miyazaki Yearling Training Farm (Miyazaki). Thoroughbred colts and fillies born in Japan between 2003 and 2010 were used. Each colt group and filly group was divided into 2 groups, respectively, and raised in Hidaka or Miyazaki for 7 months from September at 1 year old to April at 2 years old. For the growth parameters, the body weight, height at withers, and girth and cannon circumferences were measured once a month. For parameters of endocrine function, circulating prolactin, luteinizing hormone (LH), follicle-stimulating hormone (FSH), insulin-like growth factor-1 (IGF-1), testosterone, progesterone, and estradiol-17β levels were measured. Regarding growth, the rate of increase over the 7-month period was significantly higher in both colts and fillies raised in Miyazaki than in Hidaka in all 4 parameters: body weight, height at withers, and girth and cannon circumferences. The endocrine changes of the colts and fillies born in 2007 were as follows. In colts, although circulating prolactin tended to be higher in colts reared in Hidaka from October to April, circulating LH, FSH, testosterone, estradiol-17β and IGF-1 tended to be higher in colts reared in Miyazaki than in Hidaka, suggesting that the gonadotropin-releasing hormone-LH/FSH system and the growth hormone-IGF-1 system were more active in colts reared in Miyazaki as compared with those reared in Hidaka. In fillies, circulating prolactin tended to be higher in fillies reared in Hidaka in February and March, but no significant difference was noted in the serum LH, FSH, IGF-1, or progesterone level between the 2 groups. Circulating estradiol-17β tended to be higher in fillies reared in Miyazaki than in Hidaka in October and November. Regarding ovarian function, the initial ovulation occurred by the end of March in 2 (16.7%) of 12 fillies reared in Hidaka and 7 (38.9%) of 18 fillies reared in Miyazaki, suggesting that the ovarian function was more active in fillies reared in Miyazaki as compared with those reared in Hidaka. Based on these findings, it was clarified that development of the body and gonads was faster in Miyazaki compared with Hidaka in both colts and fillies.
Journal of Veterinary Medical Science | 1991
Naoaki Matsuki; Seiji Tamura; Kenichiro Ono; Toshihiro Watari; Ryo Goitsuka; Akira Yamanobe; Atsushi Hiraga; Katsuyoshi Kubo; Shigeyoshi Takagi; Atsuhiko Hasegawa; Naoyoshi Suzuki
Applied Animal Behaviour Science | 2002
Ryo Kusunose; Akira Yamanobe
Journal of Equine Science | 1994
Atsushi Hiraga; Akira Yamanobe; Katsuyoshi Kubo
Japanese Journal of Equine Science | 1992
Kei Hanzawa; Kentaro Orihara; Katsuyoshi Kubo; Akira Yamanobe; Atsushi Hiraga; Seiki Watanabe
Japanese Journal of Equine Science | 1992
Akira Yamanobe; Atsushi Hiraga; Katsuyoshi Kubo
Bulletin of Equine Research Institute | 1993
Akira Yamanobe; Atsushi Hiraga; Katsuyoshi Kubo
Journal of Equine Science | 2005
Akira Matsui; Yoshinobu Inoue; Yo Asai; Akira Yamanobe
Radioisotopes | 1991
Nobuhiko Ito; Iwao Kunugiyama; Masayoshi Tanaka; Megumi Inoue; Yoshinori Furukawa; Atsushi Hiraga; Akira Yamanobe; Katsuyoshi Kubo
Journal of Equine Science | 2008
Atsushi Okano; Yasuo Nambo; Akira Matsui; Kentaro Akiyama; Kenji Korosue; Satoshi Hayakawa; Akira Yamanobe; Shun-ichi Nagata