Of all evaluated sows, 157 returned to estrus, out of which 16 had cystic ovarian structures
that amounts to approximately 10% of returns on both farms being related to the presence of
cysts. The return to estrus observed for sows with ovarian cysts was of an interval equal to or
longer than 25 days. Possibly a large part of clinical diagnoses related to irregular returns to
estrus is compromised due to the presence of ovarian cysts. According to Meredith (1995),
one of the risk factors associated with return to estrus is the presence of irregular estrous
cycles caused by ovarian cysts