I have 2 roosters that are very aggressive and they dig there nails into all the hens backs. The hen that is badly injured has a 1 1/2 in. open cut from her back down towards her side about 2 in. long, I can see her muscle I think. It's not bleeding but it's open, how should I care for something that bad on my own? Is there anyway of keeping the roosters from being so aggressive to all my hens before another one is hurt that bad?