Brought to you by

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

Sonogram of 37-day conceptus, mare


By 37 days of gestation, most of the anechoic fluid in the conceptus is allantoic fluid, and the yolk sac is a very small anechoic space dorsally. The fetus is suspended at the dorsal aspect of the conceptus by the umbilical cord.

Courtesy of Dr. Patricia Sertich.