I've been distressed over the way my hens (8) were constantly being chased around by my three roosters. OMG!!!! They were all young peeps when I got them and I didn't know there were three roos in the bunch. Here's my story with this arrangement.
While young they all got along great. Once roos started to mount the hens (at about 6 months old) it was another story. The 6 full sized hens were chased unmercifully. Their feathers were stripped from their backs, necks, head and wing tops. It looked so sore. The full sized roos even tried to mount the two bantams. As far as I can see, the bantams have escaped their advances as there is no feather loss on them. Things got so crazy I even checked out how to de-sex the males which would turn them into capons. (The vet thought I was NUTS as I also asked him if there was a way to temper the crowing at 5:00 every morning). De-sexing can be done, but is risky. Check out this process on the web.
Anyway, I checked BYC site and found that there are "HEN SADDLES" that you can buy or make to soften the aggressive mounting. I had to modify the pattern to include a rectanglular piece of fleece fabric to cover the wing area (sort of like airplane wings) and attached it directly to the saddle. Sorry I cannot figure out how to attach a photo of one of my hens wearing this. I also added a piece of elastic to run from one side to the other to hold the saddle on their bodies. This is in addition to the elastic that goes under each wing.
I have just begun to see feather regrowth under the saddles---very slow process. Sometimes the saddles either come off or are torn off by roos and I have to wash and replace them on the hens. They do help. Sadly there is nothing I can think of to put on their sore heads and necks.
My chickens are free range and I have grown fond of them and their personalities. I am not yet ready to get rid of the roos and am considering penning them up together during the day. When they are in the coop in the evening they all get along great, but one roo does his best to keep the hens for himself during free range time. ANy thoughts on how to handle this??
Roos are great at protecting the hens from predators. In fact when all three roosters are VERY LOUD all at the same time, there is usually a predator around. They also do have to have a bush or shrub, preferably an low branched evergreen one, to hide under. When the roos make their loud noise all of the chickens make a beeline for the bush, so there is value in having them.