Accessory corpora lutea formation in pregnant Hokkaido sika deer (Cervus nippon yesoensis) investigated by examination of ovarian dynamics and steroid hormone concentrations

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  • YANAGAWA Yojiro
    Laboratory of Theriogenology, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan
  • MATSUURA Yukiko
    Hokkaido Research Center Forestry and Forest Products Research Institute, Hokkaido 062-8516, Japan
  • SUZUKI Masatsugu
    Laboratory of Zoo and Wildlife Medicine, Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan
  • SAGA Shin-ichi
    Asahiyama Zoological Park, Hoakkaido 078-8205, Japan.
  • OKUYAMA Hideto
    Asahiyama Zoological Park, Hoakkaido 078-8205, Japan.
  • FUKUI Daisuke
    Asahiyama Zoological Park, Hoakkaido 078-8205, Japan.
  • BANDO Gen
    Asahiyama Zoological Park, Hoakkaido 078-8205, Japan.
  • NAGANO Masashi
    Laboratory of Theriogenology, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan
  • KATAGIRI Seiji
    Department of Large Animal Clinical Science, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido 069-8501, Japan
  • TAKAHASHI Yoshiyuki
    Laboratory of Theriogenology, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan
  • TSUBOTA Toshio
    Laboratory of Wildlife Biology, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan

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  • Accessory corpora lutea formation in pregnant Hokkaido sika deer (<i>Cervus nippon yesoensis</i>) investigated by examination of ovarian dynamics and steroid hormone concentrations

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Generally, sika deer conceive a single fetus, but approximately 80% of pregnant females have two corpora lutea (CLs). The function of the accessory CL (ACL) is unknown; moreover, the process of ACL formation is unclear, and understanding this is necessary to know its role. To elucidate the process of ACL formation, the ovarian dynamics of six adult Hokkaido sika deer females were examined ultrasonographically together with peripheral estradiol-17β and progesterone concentrations. ACLs formed in three females that conceived at the first estrus of the breeding season, but not in those females that conceived at the second estrus. After copulation, postconception ovulation of the dominant follicle of the first wave is induced by an increase in estradiol-17β, which leads to formation of an ACL. A relatively low concentration of progesterone after the first estrus of the breeding season is considered to be responsible for the increase in estradiol-17β after copulation.

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