We have been having an extremely wet, cool year. Now our yrlg replacement hiefers are coming down with sore feet. They are a little swollen, the heifers carry a slight limp and upon inspection there is an open sore at the hairline of the hoof on the heel. On occasion, the open sore will travel between the toes. Mostly the rear feet are affected. So far we have run about 40% of the heifers thru the chute, disinfected the feet, doused them with coppertox, and then injected with about 50cc's of tetracycline. Today we also corralled them and put sulfa in the water for 5 days. Not a pleasant development. The vet thinks the forever wet ground, an overabundance of tall grass and the cool conditions are contributing to the problem. Any suggestions or experience with this?