Serial investigations of early pregnancy in pony mares using real time ultrasound scanning

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Abstract
The uteri of 13 pony mares were examined daily by ultrasound during the 1st 2 mo. of gestation. The conceptus was first identified between 12 and 16 days after ovulation and the embryo was seen on the ventral surface of the conceptus after day 21. The fetal heart could be visualized after day 22 and spontaneous movement of the fetus occurred after day 39. No consistent pattern was seen in the development of the fetal membranes, although attachment of the umbilical cord to the allantochorion was always on the dorsal aspect of the conceptus. Daily measurements were made of the diameter of the conceptus and the length of the embryo and fetus.

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