Ankole-Watusi - Two Ankole-Watusi individuals are in the Guinness World Records for the largest horn circumferences for a bull and steer respectively. The bull, had horns which measured 40.75 inches (103.5 cm) around on September 20, 2004. The steer, had horns measuring 37.5 inches (95 cm) around on May 6, 2003... Go beat that now! ;-)