Second time finding a leather egg. Could it be something besides lack in calcium. They have layer pellets though they have not been eating them very well. I leave out grit and Clam shell for calcium and once I have a bunch of crushed egg shells I feed them those. I see it eat up all the time and its consumption has increased and food decreased. My younger hens are about 25 weeks. And should already been laying but I only see twolooking like they are Any ideas?