I would just make sure they have plenty of oyster shell available. One thing I noticed this winter is that even though my oyster shell dispenser was full of oyster shell, it had been rained on (it is out in their run) and then it got frozen for several days or a week or more. So there was plenty of oyster shell but they couldn't get any of it. Now, if it gets cold I make sure its not all frozen together.
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