I forgot to mention that I learned a way to identify carriers of TH this weekend and it had nothing to do with their legs but their head. When we unloaded cows Brain Kohlstaedt was able to tell which were THC and THF by looking at the bump that goes down the middle of their head that starts at the poll. He only missed one cow that tested THC that he called THF. He said if this bump goes down like four inches they are THC and if not they are THF. I don't know if there is any fact or science to back this up but in my isolated incident there was enough of a correlation for it to be more then just chance.