eggshells look a bit strange?

[sammy]

I have gotten a few lately with lines on the shells and thinner and thicker parts and rings as well

i could post a picture if needed

what is up with the variant thickness and lines/rings of eggshell on the eggs? it is interesting looking but i want my hens to be happy too-anyone know?

 

[SandraChick]

A picture always helps....

Do you have oyster shell free choice? You should have some even if you're feeding them layer.

Might try a tsp of cider vinegar (natural with the mother)... it helps with many things including calcium absorption.

Sandra