I have a hen that was laying wrinkled eggs and was shocked to learn that might it be IB- infectious bronchitis (panic mode.) Reading on, I learned that stress could cause wrinkled eggs as there have been no other signs nor symptoms. We've had record heat here and that could certainly cause stress. We have a bottle of calcium caps from CVS pharmacy, I crushed half the caps into a fine powder and added it to their feed. I also threw out more oyster shell in their pen. I havnt had any wrinkled eggs since, that was about 2 weeks ago.