well after a month of letting our 4 older hens (2 years old) see our 13 younger chicks everyday in the coop next to them we decided to combine them. For the first 2 weeks there was some slight pecking but nothing serious, (typical pecking order stuff) this morning I come out to the coop and a young hen and rooster have gashes in their legs, the rooster is toast but the hen I might be able to save, what can I do to treat this? I took her away from the group. the young hens are about 3 months old