It's just for fun. Bulls are nominated by users of this board by way of the threads you see that are divided up by breeds. They'll be seeded according to the number of nominations they get, then paired up in brackets tournament style. The registered users of this board vote for their favorites, and watch the tournament play out and see who wins. Some will discuss why they're voting for a particular bull over another, and it can give others some pretty good insight as to why or why not they might want to use a particular bull or his offspring in their program.