title: Spontaneous multiple ovulation and development of multiple embryonic vesicles in a mare.
abstract: A Warmblood mare was observed to ovulate spontaneously 12 follicles within 2 days, none of which exceeded 22 mm in diameter. On Days 13 and 17 after ovulation, 6 embryonic vesicles were identified in the uterus by ultrasonography but by Day 26, 5 of the vesicles had disappeared. Development of the surviving conceptus was monitored until Day 42. Plasma progesterone concentrations rose to 14 ng/ml on Day 7, decreased over the next 8 days and then plateaued to around 4-6 ng/ml until Day 70. The occurrence of multiple spontaneous ovulations was diagnosed repeatedly in this mare. However, the developmental competence of the ovulated oocytes seemed to be impaired.
authors.affiliation: Department of Clinical Studies, Royal Veterinary and Agricultural University, Frederiksberg C, Denmark.
authors.forename: I
authors.initials: I
authors.lastname: Brück
authors.forename: H
authors.initials: H
authors.lastname: Lehn-Jensen
authors.forename: G
authors.initials: G
authors.lastname: Yde
mesh_terms: D000818:Animals; D010064:Embryo Implantation / Q000502:physiology*; D005260:Female; D006736:Horses / Q000097:blood / Q000196:embryology* / Q000502:physiology*; D006080:Ovarian Follicle / Q000000981:diagnostic imaging / Q000502:physiology; D010060:Ovulation / Q000502:physiology*; D011247:Pregnancy; D011374:Progesterone / Q000097:blood / Q000378:metabolism; D016216:Ultrasonography, Prenatal / Q000662:veterinary; D014599:Uterus / Q000000981:diagnostic imaging
chemical_list: D011374:Progesterone