Recently one of my Coturnix hens went through what I thought to be egg bound. Another member here had a similar experience, and it was said that too much calcium can cause egg bound problems too. Due to the egg being too hard to pass. So how does one know just how much to give ? And how often? I save egg shells, bake and grind them fro my quail. Also offer a little oyster shell in their bath. But I dont know if I give too much or not enough, and I don't want my hen or any of them to have a problem again.