Ovarian cyst incidence evaluations are usually performed on sows culled for reproductive
problems. Based on the observations made in slaughterhouses, results are transferred to the
herd. In these assessments, the incidence of cysts would be expected to be greater as compared
with females that remain in breeding herds and that are not sent to the slaughterhouse.
The sampling of tissues obtained from slaughterhouses is directed at low reproductive performance
animals, therefore, not being a reliable reflection of what is happening in the
herd. This situation should be taken into account when comparisons with data gathered
after slaughters are made