Not sure if it has already been said but you could make a ROOSTER PAD!!!
You will have to have 2 coop/ runs. One with all the hens and 1 of your favorite roos or the rooster you want to breed with, then the other coop you have all your roosters in. I know people that have 6-7 roosters in one coop, make sure the coop is big though and not to close to the hens coop and they should all be fine.
Roosters get aggressive when there are hens about, they fell the need to compete.
A rooster is a male chicken under 1 year old and a cockerel is over 1 year old.
Here in Australia we just call them roosters.