Hello BYC! I have been feeding all my chickens, even the layers, start and grow since my flock has young chickens in it. Yesterday my hen laid an huge, double yolk egg where the shell could have used so more calcium (it was hard shelled, but didn't compare to her previous eggs, and cracked when I put it down on a plate). They free range everyday and haven't had the need for oyster shells but I bought oyster shells just in case! I want to leave a bowl around for them to pick at, but I am worried my younger chickens will eat it... I've read about young chicks eating too much calcium and the health problems that accompany it. Does anyone have a flock of different ages and leave the oyster shells available to them? Do the younger chickens eat it? Should I just wait it out until all of them are "of age" to provide oyster shells?