What makes a heifer bull?

[IL Rancher]

Here are a couple of our heifer bulls.

Wouldn't want to get hooked by one of those, yowwwww...

I have heard the ealry in heat s late in heat too, some people AI that way and say they get good results.. Who knows, after a while you hear so many theories on this and that, well, it will make your head spin.