Merck Manual

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Video Sonogram of 18-Day Unilateral Twins
Video Sonogram of 18-Day Unilateral Twins
Video Sonogram of 18-Day Unilateral Twins

Care should be taken to confirm the breeding date of the mare so that these 18-day unilateral twins will not be mistaken for a 30-day singleton.

Courtesy of Dr. Patricia Sertich.
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