COLUMBIANA, Ohio — When Nick George and his wife, Kristin, were at last ready to start a livestock operation of their own, they knew they didn’t want to raise more of the same beef cattle already common in the area. Nick had wanted to work with livestock since he was a kid, but it wasn’t until a seminar took him to a Texas bison ranch that he realized which kind. “I got to spend the week watching them, and they were kind of fascinating to me,” h…