Ultrasound revealed a viable fetus with a fetal heart rate of 96 bpm as well as a second, smaller fetus with no visible heartbeat. A rectal exam revealed a lack of cervical tone with a normal CUPT (combined utero-placental thickness) but some evidence of placental separation near the cervix.
Treatment and Outcome:
The mare was continued on Regumate and was also treated with SMZs until the vaginal discharge resolved. Repeat trans-abdominal ultrasounds were performed by the primary care veterinarian every 3 weeks throughout gestation. The mare delivered a small, weak, dyspneic colt at day 326 of gestation, but unfortunately, he died within an hour of birth.