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They are calcium deposits. Do you feed a layer ration? Sometimes they get too much calcium. It can also just be a glitch in the system.
They were born last summer. I added more details below about their food regimenHi, welcome to BYC!
Check out this article...
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/
What is the age of the birds? What is fed including supplements?
Looks like excess calcium... but could be a shell gland hiccup.
If it continues for more than a few eggs you could try changing things up. I personally no longer feed a layer, I feed an all flock ration with a separate bowl of oyster shells for the calcium needs, and I no longer see egg shell quality problems. Some hens just get too much calcium from the layer ration in my opinion.They eat a layer pellet plus extra kitchen scraps. They have the option of oyster shell if they want it. Maybe the veggies they are getting are putting them over on their calcium needs. They got broccoli two weeks ago. They normally free range but our coyote and fox pollution became too active when it got cold. So now they are in their coop 24/7. I give them veggies for some “entertainment.”
That makes sense. I also was worrying about my one chicken who doesn’t lay any longer. She’s definitely taking in too much calcium because she’s eating the community food. That would solve both problems.If it continues for more than a few eggs you could try changing things up. I personally no longer feed a layer, I feed an all flock ration with a separate bowl of oyster shells for the calcium needs, and I no longer see egg shell quality problems. Some hens just get too much calcium from the layer ration in my opinion.
I also feed flock raiser with OS on the side. Works well.I also was worrying about my one chicken who doesn’t lay any longer.