No, no, a female Yak. Actually, a pregnant, female yak. They are called a Dri. A male yak is called a Ray. And the baby is called a cow (regardless of sex- they can have sex or not but they are all cows).
Here is a helpful little song to help you remember:
Dri, a Yak, a female Yak.
Ray, the Yak who knocked her up,
Cow, takes 258 full days......
There is more to the song but the rest is pointless.
Brian
Edited to correct the gestation period.... sheesh.
Is that an Asian or African yak?