Is bull meat used for beef or is it just the cows? If not then what do they do with bulls when they are born

It can be. It does not taste different. It can be a little on the tough side so is often turned to ground beef.

As for what happens to the bulls when they are born....They are castrated and then called steers. Steers grow faster, don't waste energy fighting and getting tough, and are far easier and safer to handle, since bulls often turn aggressive and can literally go from gentle and never hurting a flea to trying to kill you for little provocation. A local girl here the summer before last was nearly killed when there bull decided she had made him mad by chasing him out of the pond. He seemed to calm down and she turned to go and the next thing she knew she was being rammed and rolled by that massive head. It happens. Have to keep one or two bulls for breeding....the rest you fix.

bulls are either castrated and turned into steers and processed into beef or sold as bull to impregnate the cows there is usually only one bull per herd as one can impregnate many cows