title: Accessory corpora lutea formation in pregnant Hokkaido sika deer (Cervus nippon yesoensis) investigated by examination of ovarian dynamics and steroid hormone concentrations.
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.
authors.affiliation: Laboratory of Theriogenology, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan.
authors.forename: Yojiro
authors.initials: Y
authors.lastname: Yanagawa
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Matsuura
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Suzuki
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Saga
authors.forename: Hideto
authors.initials: H
authors.lastname: Okuyama
authors.forename: Daisuke
authors.initials: D
authors.lastname: Fukui
authors.forename: Gen
authors.initials: G
authors.lastname: Bando
authors.forename: Masashi
authors.initials: M
authors.lastname: Nagano
authors.forename: Seiji
authors.initials: S
authors.lastname: Katagiri
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Toshio
authors.initials: T
authors.lastname: Tsubota
mesh_terms: D000818:Animals; D003338:Corpus Luteum / Q000000981:diagnostic imaging / Q000378:metabolism*; D003670:Deer; D004958:Estradiol / Q000097:blood*; D004971:Estrus / Q000378:metabolism; D005260:Female; D005306:Fertilization; D007986:Luteinizing Hormone / Q000378:metabolism; D010053:Ovary / Q000378:metabolism*; D010060:Ovulation; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000097:blood*; D014463:Ultrasonography
chemical_list: D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone