These mares will undergo ultrasound exams at least once a month until they foal, then vets will determine if there are any problems with the resulting foals. Included in the ultrasound exams are studies of various anatomical features of the fetus that could indicate problems. So far, all fetuses have been normal. Some of the things being studied are width of chest, size of eye orbit, size of the aorta, and size of a femur. Starting at nine months gestation, ultrasounds will be used to measure placental thickness.
All of these exams will be videotaped for future study.