THE MERCK VETERINARY MANUALmultimedia

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  • Reproductive Cycle in Horses
  • Sonogram of a dominant follicle, mare

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    Sonogram of a dominant follicle, mare

    Usually one follicle becomes dominant during estrus. Ultrasonography of the ovaries can allow accurate measurement of the follicle. The anechoic (black) follicle is 37.2 mm in diameter.

    Courtesy of Dr. Patricia Sertich.

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