Help with identifying Egg Issue

[capebird]

One of my hens has been laying eggs with a very gritty texture on it's exterior surface.
Pict attached. Any idea what could be causing this? Thanks.

 

[chicmom]

You know, I don't know what causes that. I also have a hen that lays a gritty egg. I was thinking maybe it was from an excess of calcium, but I don't even provide the crushed oyster shells in my coop. I just buy layer pellets. (And of course they get some fresh treats).

 

[Ridgerunner]

You can read the sandpaper portion of this but don’t freak out. Many of us have hens like this and don’t have diseases in our flock. If it is one hen doing this, it is the individual. If your entire flock is doing then you look into a possible disease cause.

Egg Quality Handbook
http://www.thepoultrysite.com/ourbooks/1/egg-quality-handbook/

There are different things that can cause it, but if it is one hen and she is consistent with it, she has a problem. She is either holding onto the egg too long or her shell gland is putting on too much calcium. If it is just on rare occasions, well I have bad days too occasionally.