Hello. I just came across your post. It is said that 8 to 10 hens per room. The reason for this is roo will often mount 30 or more times a day and if your flock is lower numbers it can be hard on the girls. Bare backs, heads and combs damaged. If he has enough girls to go around he will stay busy between them and many times not choose certain hens at all. I raised a roo with a group of girls the same age but when he started mating he was very aggressive with them so I put him in with my older girls. They were about the same in size so they were fine and some of the older girls taught him manners. One hen never liked him and always bucked up and wouldn't let him on her. They do pick their favorites as well as the hens do. I have a flock of pullets now that some go to my older roosters and others to the younger roo they were raised with. I might add I have separate flocks with separate cops and runs so there is alot of look but can't touch having multiple roos and other birds. Peacocks don't necessarily like roosters and drakes will hurt hens, even kill them trying to mate. Things we learn over years and no one ever mentions.