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I figured as well, that the hens would need a calcium supplement when they began laying. I asked the dealer from where I bought my hens, as I was loading up on feed and scratch. He has had chickens for 35 years, so I presumed he knew what he was talking about. He said that as layer feed does contain some calcium, that the birds would not need it until they had layed for about a year. I was quite prepared to buy the oyster shells right then, but he actually dissuaded me from buying them.
Well as it turns out, I did get a few soft shelled, and thin shelled eggs within a few months of the hens beginning to lay. I washed, and dried egg shells, crushed them in a mortice & pestal, then mixed them in with some whole oats, softened with a little warm water. They eggs they layed from that point were firm, and thick. I now keep a small container of crushed egg shells in the coop, as well as mixing some in with treats from time to time, and never had the soft/thin shell problem again.
Just goes to show you, that even though this person had years of experience with hens, perhaps they were of the heritage variety, and not like the "bred to lay" variety sex-links, I have. I can't see how a bird that lays an egg every single day could not need a calcium supplement of sorts.
Are you free ranging? If so you would need the extra calcium. I would bet the man with 35 years is feeding laying mash with all the calcium mixed in.
Commercial producers don't have room for buffet style dinning
so everything is in there feed.