I just got a new roo on the 12th. The guy I got him from said he didn't have a problem with him being aggressive but he was also with 3 other roos. I have 5 hens in with him. At first the girls didn't have much to do with him. Now he's able to get to some of them and I noticed today he's picked spots on the back of the necks on 2 of the hens.They look awful. He's really only able to mate with 3 of them. 2 of my other girls are a little hateful for lack of better word. It took them months to warm up to our first rooster. If he walks by them they run. All of my hens are at a year old or older. He's about a 8-12 months old. Any advice about what I can do?