After fighting off the hawk, was there any bleeding, maybe from his comb?
If so, this could have triggered the feather biting and eating behaviour as the blood would trickle onto his hackles and breast and back/saddle feathers causing the hens to peck at it and even eat the dried blood off of him as they like the taste.
I have had to deal with this once after one of my roosters decided to take a hefty bite at the combs of every single one of the other 8 roosters in the flock. This happened in the winter and the red blood flowing was very enticing for some of my RIR hens and RIR-Mixes. They would follow the bleeding roosters everywhere while eating their bloodstained feathers and would even peck at their comb to make them bleed more when the bloodflow would finally subside.
My other hens of different breeds left the bleeding roosters alone and did not join in.
I had to separate all 9 roosters, wash and blow dry them so no more blood was left on their plumage, but as soon as I put them back in the flock some of the earlier cannibalism-hens would start again, so I had to butcher them as well as the comb biting rooster to restore the peace in the flock.
If so, this could have triggered the feather biting and eating behaviour as the blood would trickle onto his hackles and breast and back/saddle feathers causing the hens to peck at it and even eat the dried blood off of him as they like the taste.
I have had to deal with this once after one of my roosters decided to take a hefty bite at the combs of every single one of the other 8 roosters in the flock. This happened in the winter and the red blood flowing was very enticing for some of my RIR hens and RIR-Mixes. They would follow the bleeding roosters everywhere while eating their bloodstained feathers and would even peck at their comb to make them bleed more when the bloodflow would finally subside.
My other hens of different breeds left the bleeding roosters alone and did not join in.
I had to separate all 9 roosters, wash and blow dry them so no more blood was left on their plumage, but as soon as I put them back in the flock some of the earlier cannibalism-hens would start again, so I had to butcher them as well as the comb biting rooster to restore the peace in the flock.
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