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It doesn't really "harden" as shell formation is a continuous deposition of calcium carbonate applied by the shell gland over a 20 hour period. Unless they are laying very late in the day a majority of that shell formation is going on at night.
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Wow! That's important info to know. Do you think the extra calcium at night is as important in the winter, though, if a hen has stopped laying for the season?
No, not if they aren't producing. They will just pass any extra calcium that they aren't using.
I agree with everything but the reasoning behind the corn. Corn can help them keep their energy levels up, but they can also do the same by eating more layer feed, yet they don't need the extra protein and minerals that come with the extra layer feed, so corn can help the dilute the amount of...