Clinical metritis is an acute systemic illness due to infection of the uterus with bacteria, usually within 10 (21) days after parturition. According to Sheldon et al. [5], clinical metritis can be categorized into three grades: Grade 1 clinical metritis (CM1) can be characterized by an abnormally enlarged uterus and a purulent uterine discharge detectable in the vagina, within 21 days after calving. Grade 2 clinical metritis (CM2) or puerperal metritis can be characterized by a fetid red-brown watery uterine discharge, atonic enlarged uterus and, usually pyrexia (>39.5°C) [6,7]; in severe cases, reduced milk yield, dullness, inappetence or anorexia, elevated heart rate, and apparent dehydration may also be present. In some cases pyrexia even with daily monitoring of rectal temperature could not be detected [4,8] however an enlarged uterus with a thin wall and atonia used to be present with a fetid discharge. Puerperal metritis is often associated with retained placenta, dystocia, stillbirth or twins, and usually occurs toward the end of the first week after calving, being rare after the second week after calving [7,9,10]. It is important to emphasize