If you really want to know what is going on nutritionally in your cattle it’s best to find someone that can do liver biopsy’s for you. I think it was Andre Voisin who wrote in one of his books that liver biopsy’s will be one of the most powerful tools to tell the health of your whole farm system. We started using them this year and have definitely learned some surprising results. We plan to keep it as a key part of our farm management system going forward.