Udder Edema in Sheep and Goats Udder edema is a metabolic condition marked by fluid buildup and swelling in the udder, and in severe cases, the abdominal cavity. It typically results from a combination of factors: genetics, pre-birth nutrition, and natural metabolic changes during pregnancy. Sometimes, increased blood flow at the start of lactation causes fluid to accumulate until the lymphatic system clears it. While udder edema can occur during any lactation, it is more common in first-time mo