Recently, I've been getting many defective eggs from my small flock of backyard chickens. 1. The shell texture is rough, almost like sandpaper with tiny little bumps 2. The shells are generally very thin 3. The whites of the egg are gooey and clumpy and seem to have a lot of water (lots of popping on the frying pan!) Although I can't be certain, I suspect that these eggs might come from a single chicken. It's hard to tell though, since I have four Red Comets that lay similar colored eggs. The one thing I do know is that all these defective eggs are from the Red Comets. I have been providing them with oyster shells, but have seen no improvement. A quick search on the web tells me that IB might be a possibility. The chickens seem healthy on the outside. However, there was one Red Comet that had been coughing/sneezing a lot roughly a month ago. She is fine now though, and at the time, I thought that it might have been the dust in the summer. If this is indeed caused by a disease like IB, should I cull my entire flock? The non-Red Comet chickens (an Americana and a Sussex) lay perfectly fine eggs. On a related note, if I were to cull the Red Comets, would it be safe to eat them? It seems like a bit of a waste to throw them away, especially since there are no visible signs of disease on the outside.