we've been double digit negative for weeks now, down to -26 and my chickens are all fine in an unheated, uninsulated coop. I do have a heated bowl, but no heat lamps at all. Even my leghorns are fine, just with a bit of mild frostbite on the comb tips. My bantams don't even seem to notice the cold. I am getting eggs from all of them, even some newbie pullet layers..
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