This is the 10244th most frequent Japanese word.
雌
"雌" means "female" or "feminine" (typically used for animals).
The word '雌' specifies that the cows mentioned are female.
その農場では雌牛を飼育しています。
On that farm, they raise female cows.
Here, '雌' identifies the gender of the bird being described.
この鳥の雌は巣を守ります。
The female of this bird guards the nest.
In this sentence, '雌' denotes the gender of the lions involved in hunting.