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

Yojiro YANAGAWA; Yukiko MATSUURA; Masatsugu SUZUKI; Shin-ichi SAGA; Hideto OKUYAMA; Daisuke FUKUI; Gen BANDO; Masashi NAGANO; Seiji KATAGIRI; Yoshiyuki TAKAHASHI; Toshio TSUBOTA

doi:10.1262/jrd.2014-076

Original Articles

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

Yojiro YANAGAWA, Yukiko MATSUURA, Masatsugu SUZUKI, Shin-ichi SAGA, Hideto OKUYAMA, Daisuke FUKUI, Gen BANDO, Masashi NAGANO, Seiji KATAGIRI, Yoshiyuki TAKAHASHI, Toshio TSUBOTA

Author information

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

Keywords: Accessory corpus luteum, Estradiol, Follicular wave, Progesterone, Sika deer

JOURNAL FREE ACCESS

2015 Volume 61 Issue 1 Pages 61-66

DOI https://doi.org/10.1262/jrd.2014-076

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Details

Abstract

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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