It can also be boeuf depending on the region or context.
Here are some examples:
* Le bœuf est un animal puissant. (The ox is a powerful animal.)
* J'ai mangé du bœuf hier soir. (I ate beef last night.)
However, it's important to note that "bœuf" can also refer to beef, not just the animal itself. So the context will determine whether it means the animal or the meat.