title: Clinical report: Recovery of a degenerating 14-day embryo in the uterine flush of a mare 7 days after ovulation.
abstract: A 15-mm diameter degenerating embryonic vesicle and a normal, 200-u early blastocyst were recovered in a uterine flush of a mare 7 d after ovulation. From its size, the degenerating vesicle appeared to be 13 to 14 d of age. The mare had been bred during a previous cycle and then treated with prostaglandin 9 days after ovulation. The advanced vesicle that was recovered suggests that a conceptus from the previous cycle continued to grow for about 5 d after prostaglandin administration, and remained in the uterus during estrus, when plasma progesterone concentrations were below 1 ng/ml. From the estimated age of the conceptus, its development stopped at about the time the mare was inseminated. Had this conceptus survived through estrus and insemination, superfetation would have occurred.
authors.affiliation: Section of Reproductive Studies New Bolton Center School of Veterinary Medicine, University of Pennsylvania 382 West Street Road, Kennett Square, PA 19348 USA.
authors.forename: K
authors.initials: K
authors.lastname: Hinrichs
authors.forename: E D
authors.initials: ED
authors.lastname: Watson