I recently spent $2500 on a young Black Angus bull. I put him out with the herd but he just ate grass and wouldn't even look at a cow. I was beginning to think I had paid more for that bull than he was worth.
Anyhow, I had the Vet come have a look at him. He said the bull was very healthy, but possibly just a little young, so he gave me some pills to feed him once per day. The bull started to service the cows within two days...all my cows! He even broke through the fence and bred all my neighbor's cows! He's like a machine! I don't know what was in the pills the Vet gave him but they kind of taste like peppermint.
