Weird wrinkled eggs?

[Lynn57]

I've now got two of these weird shaped eggs from my 1.5 yr old ISA hens.
Any ideas how or why they have this wrinkled shell??

thanks

 

[chickendude]

looks like to much calcium depositing and collecting as the egg develops and travels through the hen.

 

[Lynn57]

Is she consuming too much oyster shell then? Should I take the free choice oyster shell away and just keep them on the layer mash and other feed?

thanks

 

[CMV]

This site is a great reference.
http://www.thepoultrysite.com/publications/1/egg-quality-handbook/20/bodychecked-eggs
I hope it helps.

 

[Lynn57]

Oh thanks so much...that totally explains it!