Late last month I drove out into the field and realized that my angus cows had lost all of their hair.. I have tried to talk to a vet about it but most of the local ones don't come out to do vet work on cattle anymore. Any ideas? Its not the mange I have poured ivomec on all of them and still they aren't showing any progress, a friend of mine said it could be rain rot if so how would I treat it?