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Cool. I finally found a use for my oyster shell that I purchased earlier this year! When I first got the chooks, I saved my egg shells, then baked and crushed them to feed back to the girls. When all my girls are laying age, I feed layer food and find they don't eat a lot of supplemental calcium. However every Spring I add a few new chicks and for the period of time that all are eating out of the same feeder, I switch to grower formula and add supplemental calcium for the layers. Anyway, I found that the layers LOVE the crushed egg shell. They recognize the jar I keep it in and every day when I went outside to give it to them they would be literally jumping up in the air pecking at the outside of the jar in their eagerness to get to it. I'd put some in my palm and they'd gobble it down like it was scratch. Since I let them eat as much as they seemed to want/need, eventually I ran out of egg shells, and had to buy some oyster shell. I expected them to go for it as they did the egg shell but no. They refused to touch it. VERY occasionally one of them will peck at it in a disinterested kind of way but.....of the 50lb bag I bought, I'd guess I still have more than 49.75lb. Meanwhile, I have continued to save egg shells, but once they were back on layer feed, they mostly lost interest in this too. This is good actually, as it has allowed me to build up a good supply so that next Spring when I get my new chicks and have to put them back on grower formula, I should have enough egg shell saved to get them through those 8-12 weeks that they need the supplement.
By the way, I have had NO issues with egg eating. I do understand the concerns people about this, but I have always baked the shells (doesn't require much effort. Whenever I use an egg, I place the shell on a cookie sheet. After I've used the oven and turned it off, I put the cookie sheet in the oven so the shells bake in the residual heat of the oven as it cools down. Doing it this way I don't need to worry about timers and burning them - they are always just perfectly dried out and easy to crush). I crush manually and get them down to 1/4" size pieces. I really do not think the girls recognize them at all.
And now that I have a practical use for the oyster shell on the garden, I don't have to kick myself as much for spending the money on such a big bag.