This syndrome provokes a decrease of fertility with an increased percentage of returns to heat higher than the normal rate considered in every farm.

Shorter lactations predispose to its appearance because they do not allow a complete uterine regression that lasts usually from 21 to 28 days. Furthermore, sows with more than five litters have more chances to suffer this process because its uterine regression is slower and its natural defences tend to decrease with age. Also late inseminations can be a cause of future endometritis.

Control and treatment of this problem are based mainly on maintaining the hygienic conditions of the environment, avoiding dirty and wet floors in boar pens, estrous detection pens, mating, pregnancy and farrowing areas; the hygienic conditions during handling procedures of semen collection and semen manipulation, insemination procedure and farrowing tasks; culling of sows with vaginal discharges and frequent returns to heat; lengthening a lactation period as much as possible. Once these measures have been established, control can be reinforced with the use of the intramuscular administration of PGF2a 36-48 hours postfarrowing and a broad spectrum antibiotic. Uterine drainages should not be practiced in order to avoid opportunities for the introduction of the infection.