Poultry > Facilities & Housing
The temperature requirements are that the hens should not be exposed to freezing temperatures for very long. If they develop black spots on their combs, then their combs have frozen. You are doing the right thing by bringing them in until the temperature moderates. If at all possible you might have to build another cage for them. The one you have would be O.K. and maybe you should go to a lower wattage bulb so they won't get too warm.
Ken Koelkebeck Poultry Extension Specialist
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