My two Ancona roos have dark discoloration on the tips of their combs. It is not on their wattles or earlobes and none of my other roos or chickens have it. Just these two. Here is what it looks like:
I don't see why it would be frostbite. It has been down in the teens at night for the past few weeks, but their coop is wrapped totally in thick platic and they all roost shoulder-to-shoulder so the body heat is there too. They also have a mini-coop incase a few get chased out or want to be alone. Here's some pics of the coop:
Main Coop (Now wrapped in plastic) :
Mini-Coop:

I don't see why it would be frostbite. It has been down in the teens at night for the past few weeks, but their coop is wrapped totally in thick platic and they all roost shoulder-to-shoulder so the body heat is there too. They also have a mini-coop incase a few get chased out or want to be alone. Here's some pics of the coop:
Main Coop (Now wrapped in plastic) :

Mini-Coop:

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