A couple of ways. You can house roosters separately and let them out a couple times a week for conjugal visits."Mature roosters also require much less protein than growing birds and laying hens.
13-14% crude protein is adequate."
How do you manage this? How do you get the rooster to eat from a different dish than the hens?
The easiest I've found and one I believe commercial breeders sometimes use is to use different type feeders. Rooster feeders can be hanging feeders that are too high for hens to use them and lower feeders for hens that the rooster can't fit his head into.