Several of the cows on the farm where I work have nasty, ulcerated sores on their legs. Often these seem to occur on the inside of the hock, although I have one with a sore on the front of her front leg right now. The sores are about the size of a silver dollar and are accompanied by swelling and pain (can tell by the way the cow moves). What causes these sores? What can be done to treat them? I do try to lavage (hose them out) while the cows are in the parlor, when the temperature's above freezing, but I'm not sure this is doing any good. Hate to see my girls hurtin'.