I looked through the past posts and didn't see anything on this topic. For about a month or so my very reliable chickens have been laying wrinkled eggs. Well, the shell is wrinkled. One even had a big blob of shell coming off the end of one egg that got folded! Of 3 eggs every day, one seemed to be much worse that the other 2. I am guessing this is some kind of a mineral/calcium imbalance? More recently, they have been laying very thin shelled eggs instead of the nice thick ones. I had them on Turkey and Game maintenence feed that the Feed Store recommended because I have everyone (chickens, pigeons, ducks, and a turkey) in together (I know I am bad but they all get along fine). I just switched over to Egg Layer feed to give it a try instead. Any ideas?