Bubble on egg

[ywolf]

I have a barred rock and this is the second time she's laid an egg like this. Is this a nutrition problem or is there something else going on? The eggs I was getting before were perfectly normal, this just started recently and none of my other chickens are laying eggs like this (I also have an araucana, Rhode Island Red, and a golden comet).

 

[oldhenlikesdogs]

One of my Easter eggers laid them for about 2 months before she straightened back out, no clue what caused them, but it did stop. Some causes are bronchitis, being frightened and incorrect lighting, none of those applied to my hen.

 

[aart]

Welcome to BYC!

That's called 'slab sided' egg......could be several causes.
#11 in this article:
https://www.backyardchickens.com/a/common-egg-quality-problems

Could also just be a glitch.
Had a couple birds lay them all winter one year, they may have had a mild respiratory infection.