Beefalo has significantly less calories, fat, and cholesterol, than beef cattle, chicken, and cod. Wisent-cattle hybrids also occur, similarly to the North American beefalo. In 1983, the three main Beefalo registration groups reorganized under the American Beefalo World Registry. Other, more exotic hybrids such as "beefalo" are also used for specialty markets. Male yak bred to beefalo produced fertile females and sterile males.