Here's why:
* Bovine refers to any animal belonging to the family Bovidae, which includes cattle, buffalo, bison, and other related species.
* Bull is a male cow.
* Cow is a female cow.
Therefore, a bull cow is still a member of the Bovidae family, making it a bovine.
It's important to note that the term "bull cow" is not commonly used. It's more typical to refer to a female cow as a "cow" and a male cow as a "bull."