A guy I work with told me his son's hens lay eggs with weak yolks, meaning the yolks break easily when he cracks the egg. He likes fried eggs and a broken yolk is not desireable. I must admit that a few of my eggs have done the same thing. I keep oyster shell out all the time and the shells are nice and firm. Most of the yolks are firm but I do occasionally have some break. He said his son's are all like that and wants to know what can be done about it. Anyone else have this problem or know what to feed the hens to fix it?