Ultrasound image of a uterine horn in cross-section, containing abundant hypoechoic fluid with punctate hyperechoic areas (fibrin flecks). Linear probe, 7 MHz, depth 12 cm, focus 4.5 cm. Uterine infection results in a lack of PGF2α production, which is responsible for luteolysis. In these cases, a persistent corpus luteum can be identified at the ovarian level, and the animal remains in anestrus. Treatment: administration of PGF2α to initiate luteolysis and the elimination of purulent content through the opening of the cervix.
