Have 12 week old chickens and have over the last couple of weeks had several of the rumps pecked bloody even to the point of death of 1. The rest I have caught in time and treated with pine tar and they seem to be doing fine. Today had 2 pecked bloody and the only chicken with blood on face area was a rooster. (White Rock) Do they tend to do this? I have put him in his own jail cell....How long do I need to keep him separated or is this a habit that will lead to the dumplin pot?