Shell-less eggs

[SallyF]

I have a hen (don't know which one) who is occasionally laying a shell-less egg. They're fed layer pellets, also free-range, and have oyster shell available. I've read up on the possible causes of this. Are these eggs usable in baked products, or should I just cook them and feed them back to the chickens?

 

[EggSighted4Life]

I feed them back the the chickens.

It can be a hiccup of birds just coming into or exiting lay for the season... aside from all the other possible causes.