Someone just told me to do that so my hens get extra calcium and produce eggs with really nice, hard shells. She said that some eggs can be soft when there isn't enough calcium. Is that true? I'm sure the food I buy for them, along with some table scraps, gives them plenty of calcium. I will definitely do it, but I want to make sure it won't give them a "taste" for their eggs or something and then they start eating their eggs, which I heard they might do anyway... Any thoughts on that?