Bos (from Latin
bōs: cow, ox, bull) is the genus of wild and domestic cattle.
Bos can be divided into four subgenera:
Bos,
Bibos,
Novibos, and
Poephagus, but these divisions are controversial. The genus has five extant species. However, this may rise to seven if the domesticated varieties are counted as separate species, and nine if the closely related genus
Bison is also included. Most modern breeds of domesticated cattle are believe
(Wikipedia)