Find information on animal health topics, written for the veterinary professional.

Sonogram of 13-day conceptus, mare


The anechoic (black) yolk sac moves throughout the uterine horns and body from day 6–16 of gestation. A specular reflector (white dash) is imaged at the dorsal and ventral aspect of the yolk sac.

Courtesy of Dr. Patricia Sertich.