What causes wrinkly eggshells? There's always only one egg a day that looks like this.

[Bruthabuz]

 

[Wyorp Rock]

Have you ever had respiratory illness within your flock?
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

 

[Chicken_tiger_catt]

View attachment 3795866View attachment 3795867

maybe a calcium imbalance?

 

[Bruthabuz]

Have you ever had respiratory illness within your flock?
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

Not to my knowledge. Every one of my 34 girls seems normal.

 

[Bruthabuz]

maybe a calcium imbalance?

All 34 of them get the same feed. I'm assuming only one of them is laying the wrinkly egg.

 

[Bruthabuz]

Have you ever had respiratory illness within your flock?
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

Thanks for the link. This egg most closely resembles the Corrugated Shell (#13). Of the possible causes, I think the most likely would be either hereditary or a defective shell gland. I'm assuming it is coming from just one individual. There are no flock-wide symptoms of any disease and they are all treated the same way, i.e. feed, care, etc..

 

[Loving my girls]

I have a hen that lays eggs just like this all the time, a wyandotte called Ruby, I believe it is caused by either stress or the egg simply is not turning correctly as it is made, or both.
As far as I am aware and certainly in my experience it’s nothing to worry about as I say Ruby has been laying them for years and she is as healthy as healthy can be.
Hope this helps
Hugz

 

[aart]

Of the possible causes, I think the most likely would be either hereditary or a defective shell gland.

You nailed it.