I have one laying hen whose eggs have recently become more and more pimpled at the ends. I didn't think much of it until a few days ago she started laying eggs with fine vertical lines near the middle of the egg shell like almost creases. Now today she laid an egg with tiny white spots on the shell, which I've heard could be calcium deposits. She is nearly one year old and otherwise healthy and has been eating layer pellets with very few treats of bits of fruit or veg, plus she scratches about an the grass and mud of the garden for about an hour a day. What could be the cause of these problems? I don't give anything with calcium except the layer pellets, so if she is getting too much calcium, how can I cut her down? I have a giant bag of the stuff to last til the spring so cant really try a different feed brand.