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i've got four girls just now starting to lay eggs. i have five that are about two months younger & two, maybe three or those five are roosters. i'm guessing i need to put oyster shell out for the egg layers but if the others use it, what happens to them?
So, to answer your question.
With little chicks the extra calcium from either layer feed or supplements like oyster shell, can be potentially hard on their little kidneys.
At about 13 weeks your chicks are no longer so little, and neither are their kidneys.
I don't think I'd be too worried about it, unless I saw the younger ones regularly eating the shell. If I did I think I'd remove the shell till the younger ones were 18 weeks old.
Imp