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The shell thickness and texture changes with the vitamins and minerals the hen receives. That is why that if an egg gets broken they will consume not only the egg but also the egg shell. In the past farmers would save their egg shells from the kitchen, dry them out and crush them to be fed back to the hens.

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Wiki User

16y ago
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Scarlett Langley

Lvl 1
1y ago
they are smooth and round

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Q: What makes chicken's eggs rough or Smooth?
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