THE MERCK VETERINARY MANUALmultimedia

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  • Pregnancy Determination in Horses
  • Sonogram of 21-day conceptus, mare

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    Sonogram of 21-day conceptus, mare

    The conceptus is still "guitar pick"–shaped at 21 days, and the hyperechoic embryo proper can be seen at the ventral aspect of the anechoic yolk sac.

    Courtesy of Dr. Patricia Sertich.

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