Most recently Tejas Tip 2 Tip held the Guineas record at 10 feet, 2 3/4 inches. Here is a newspaper article about that steer. https://www.google.com/url?sa=t&source=web&rct=j&url=http://austin.blog.statesman.com/2017/02/23/this-texas-steer-may-have-the-worlds-longest-horns/&ved=2ahUKEwiT6cjau4LdAhUR5awKHR5AArgQFjAVegQIBBAB&usg=AOvVaw3lHV5-clOBGcDmHnQZQi_X
Recent Guinness world record holder was 122 3/4 inches. Prior to that was 121".
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