Cow

Family: Bovidae, 
Subfamily: Bovinae, 
Genus: Bos, 
Species: taurus. 
Resulting in Bos taurus.
("The cow is of the bovine ilk; one end is moo, the other milk." Ogden Nash). 
Quoted only to remind us that the term cow is female, cattle is a collective term and doesn't imply gender, while a bull is the male of the species. An altered bull is a steer and young cattle go by the name calf or calves which also doesn't imply gender, and a young female of the species (under two years of age) is called a heifer.