I agree that I would try the older pen, and multiple feed and water stations first. I would only cull as a last resort.
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Honestly I'm thinking that pen is too crowded..I have been having a terrible time with chick loss in one pen. Chicks are 3 weeks old. There were 16 of them in a 4x4 pen. I have several pens in the same room of the same barn, similar sized flocks. Lost five chicks over two days, started everyone on Corid and thoroughly disinfected the pen after the first death but they kept dropping. None of the other pens in that room have had any losses.
Fast forward to today. Disinfecting that pen again after removing a lethargic chick with an empty crop. Put fresh water down, fresh food down, and watch because everyone is just huddled in a corner. Finally two approach the water. Like a mini velociraptor, a barnevelder chick rushes out and latches on to one by the face. I grabbed the offending chick, and she had such a tight grip that the other was picked up with it. A few seconds later, another approached the water and she attacked that chick too.
Food and water are NEVER scarce. I had noticed that they have a lot food and water left the past few days. I suspect she has been keeping the others from eating. I saw one with blood on its wing too. I removed her and when I just checked on that pen, everyone is happily eating and drinking, but now the question is what do I do with her? Cull? Toss into an older pen and hope they set her straight?
If a Rooster was helping to raise those chicks he would of stopped that quickly. Definitely certain breeds of Cockerel fight.Check this out. Crowding not always required. When the dominiques have done it, I think feed somehow involved as in they were malnourished.
I think all breeds have capacity for it, and sometimes even females do it. When females did it, it looked very much like feed was involved. It would cease when feed changed sometimes.If a Rooster was helping to raise those chicks he would of stopped that quickly. Definitely certain breeds of Cockerel fight.
Yes..Pullets can act like that also. I sold off my standard breeds and only have Bantam now. They never act horrible. My Rooster corrects them before things escalate..I think all breeds have capacity for it, and sometimes even females do it. When females did it, it looked very much like feed was involved. It would cease when feed changed sometimes.
It may be similar in ways to cannibalism, although where I see it attacks are directed at head. In production flocks attacks usually directed at body. Example above has lots of sounds produced indicating aggression.