why would a chicken lay an egg like this

[WeLuvRuckus]

My in laws have found a few eggs like this. The are big and the shell is feels wrinkly.

 

[balbrt1]

Ough!

 

[A Chicken Owner]

These eggs are usually laid by older hens. Feeding hens shell grit may assist with this problem.

 

[WeLuvRuckus]

Thanks they are 4 or 5 years old