High energy feeds burn out their livers and contribute to the ruining of bulls by storing fat in places that you don't want or need it. High protein, moderate fat feeds are what you want, say 80% rolled oats with 20% rolled corn. Best bulls you can buy are fed moderate protein feeds their first year, pastured over the summer and then fed hay and a little corn silage their 2nd year before being used as a 2 year old.
I don't believe in yearling bulls. They get pushed way too hard on the feed and then get pushed to breed a fair number of cows, by us, come summer. If I had a choice between buying a $1600 yearling and a $2500-3000 2 year old, I'll buy the 2 year old every time...as long as I know he has been grown out properly. :cowboy: