I read your article, Thank you @aart--I missed the "once a week" part earlier!

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A good reminder! Thanks, aart!I just give some EL/Vit once a week during extreme cold.
You can overdo the EL.
Details here:
https://www.backyardchickens.com/articles/aarts-extreme-weather-spiel.75893/
We're going to have slightly warmer temps and calmer wind with sun so I think we'll try opening their pop door! Thanks!We had a high of -11 F today, and its windy. I have chickens hanging out in the run enjoying the sunshine. Are they thrilled with this crap? No. But they're handling it like troopers.