Watch that cattle on heavy feeding are not getting acidosis; look out for loose dungs, cud balls, drooling of saliva and lameness.
Many young bulls are on ad-lib feeding.
It is important that they have access to plenty of water, and have straw if they want it. In order to keep up performance, high-energy feeds must be fed to intensively finished stock.
Make sure, if you are feeding high rates of cereals, that they are rumen friendly and will not cause digestive upsets.