'Bulls' in the Bible

Their bulls breed without fail. Their cows calve, and don't miscarry.

Now therefore, take to yourselves seven bulls and seven rams, and go to my servant Job, and offer up for yourselves a burnt offering; and my servant Job shall pray for you, for I will accept him, that I not deal with you according to your folly. For you have not spoken of me the thing that is right, as my servant Job has."