Hi, it's been a while. Our 4 hens are healthy and fine but one of them is laying very fragile eggs that break as the hen gets out of the nest. The other 3 hens eggs are just fine, only one hen has this thin shell problem. I give them oyster shell and feed that is fortified with Ca but the problem persists for just this one hen. Not sure if this is a congenital problem or if this hen doesn't consume enough oyster shell? Is there a calcium source that I can add to their drinking water to remedy this thin shell problem? Thanks for any help.