@RoyalChick beat me to it.
But as for this, my friend -
chickens laying hens is not a problem that can simply be ignored.
But as for this, my friend -
... most of us are very condcientious about providing calcium for our chickens. May I say that if/when any fail to adequately do so (usually newbies), either by feeding good layer pellets or by providing a never-ending supply of oyster shell on the side for our layers, we are almost immediately alerted to the fact that our hens ar deficient in said calcium when we start finding soft-shell or shell-less eggs in the nests? It is a problem that cries out for a prompt solution. If you hang out on these boards very long at all, or do any kind of a deep dive into the search engine here, I dare say you'll find requests for help for soft-shell or "jelly" eggs nearly every day. Insufficient calcium inwould say the food has to be taken into account as well, when there is profit first in the food chain things like calcium, magnesium are left out.
If the chickens don't have it in their food, they cannot put it in their bodies at any speed.