Our flock of 7 have been laying for 1 yr now. 4 RIR and 3 Barred Rocks. My ? is I've noticed the texture of the eggs aren't even. Some are really smooth while others are spotted and rough. They free range for about 2 hrs a day, get plenty of fresh veggies and fruits along with pellets. What causes egg shells to vary so. As always thanks for answering my ?'s.