High production during the previous lactation (above 6,571 kg) is a risk factor for presenting purulent vaginal discharge in grazing cows post-calving.
Uterine bacterial contamination is common in dairy cattle during the first 2 weeks postpartum. Endometritis causes delayed ovarian activity and prolonged luteal phases, resulting in reduce submission, conception and pregnancy rates and increased culling.
Endometritis is defined as a process that causes superficial endometrial inflammation with the presence or not of purulent vaginal discharge (PVD) between 21- and 49-days post-partum. PVD in cows during the puerperium has a negative affect on milk production and farm profitability
Clinical endometritis is defined as purulent or mucopurulent uterine discharge present in the vagina after 21 days postpartum, and it is associated with tissue damage, delayed uterine involution, disruption of endometrial function, and perturbation of ovarian cycles.