I keep nearly all of my breeds in pairs, trios, quads or in one case--5 hens and one rooster. I very rarely have any issues. The only issue is that the "favorite" hen will start getting a bald back. I have saddles for each & every hen and then a stack of extras. On the rare occasion that doesn't work, I pull the roosters out and give the hens a break for a few weeks. Any rooster that is overly aggressive with breeding, I do not keep.