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  • Title: Spontaneous multiple ovulation and development of multiple embryonic vesicles in a mare.
    Author: Brück I, Lehn-Jensen H, Yde G.
    Journal: Equine Vet J Suppl; 1997 Dec; (25):63-8. PubMed ID: 9593531.
    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.
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