What could be wrong to cause this egg?

[aart]

OS is always available in a separate dish.

But are they eating it...especially since the feed change?
Some birds don't 'get' eating the OS at first.
If you knew which bird you could get her to eat some then know if that's the problem.

 

[mowin]

But are they eating it...especially since the feed change?

Not as much since the new feed is layer feed which has calcium in it. I'm thinking if it was a calcium issue, more of the hens would be having issues. All of the other eggs have a strong shell.

 

[Ebony Rose]

She may not be utilizing the calcium effectively. Dark leafy greens are high in calcium (but low in protein). Sardines (bone in) are high in both calcium and protein. Dry cat food is a high protein treat that also is fortified with calcium, vitamins and other minerals and has a decent amino acid profile for occasional use (birds get fat if you feed it too often, and fat birds have problems laying eggs). I keep both sardines and dry cat food on hand for protein boosts.
I don't own a cat, but I do raise quail, chickens and have a couple dogs. Depending upon my needs, I can bury medicine in sardines, grind dry cat food for a high protein boost for baby chicks or sick birds, or even add water to and soften dry cat food as a special treat for any of the animals.
Hope you are able to either determine the bird affected, or at least remedy the problem with a dietary change soon. Thin shelled eggs are no laughing matter to the girl that's suffering with this problem.
I see no reason to cull her unless or until her issue results in a low quality of life for her.

 

[Oncoming Storm]

OS is always available in a separate dish.

Some hens won’t eat them. I have a hen that struggles with calcium and she freaking REFUSES to eat the oyster shells. It’s ridiculous XD.

 

[aart]

Not as much since the new feed is layer feed which has calcium in it. I'm thinking if it was a calcium issue, more of the hens would be having issues. All of the other eggs have a strong shell.

I misread your feed switch.....thought you went from layer to all flock.
So probably not a lack of calcium.
You are correct when all birds but one are lying good shells, then it's a problem with that one bird itself. Hard to know if she's not eating enough overall, or she's stressed, or she's just a 'dud'. Until you find out which bird, it's all just a guess.
Maybe I missed this too, how old is she?

 

[mowin]

I misread your feed switch.....thought you went from layer to all flock.
So probably not a lack of calcium.
You are correct when all birds but one are lying good shells, then it's a problem with that one bird itself. Hard to know if she's not eating enough overall, or she's stressed, or she's just a 'dud'. Until you find out which bird, it's all just a guess.
Maybe I missed this too, how old is she?

All birds were 1yr this March. I'm leaning towards the food. The all flock was a name brand from Agway. Was $16.99 40lb.
Switched to Dumore from tractor supply. $14.99 50lbs.
Going to switch back.

 

[aart]

All birds were 1yr this March. I'm leaning towards the food. The all flock was a name brand from Agway. Was $16.99 40lb.
Switched to Dumore from tractor supply. $14.99 50lbs.
Going to switch back.

Are you paying attention to the manufacturing dates on the feed bags?
Usually printed on the sew strip or nutrition tag.
Old feed can be nutritionally deficient.
I try to buy the freshest, it really goes downhill after 3 months or so....but 'shelf life' at most farm stores is 6 months.

She may be ramping down production for molting and winter break,
you can get some funky eggs around that time.

 

[Stepnout]

Last year I had a bird who was my Layer or the first year. She was the first to lay and Consistently laid more eggs Than the rest. At bout 14 months she crashed. Every egg shell was wrinkled and had seems in the shell. All other eggs from the other birds were good. They were on proper always fresh layer feed with free choice OS. They were free ranged for a couple hours a day. Sadly she went down hill producing shell less eggs. She became ill and within a month I culled her.
I just think it was one of those things.

 

[mowin]

Are you paying attention to the manufacturing dates on the feed bags?
Usually printed on the sew strip or nutrition tag.
Old feed can be nutritionally deficient.
I try to buy the freshest, it really goes downhill after 3 months or so....but 'shelf life' at most farm stores is 6 months.

She may be ramping down production for molting and winter break,
you can get some funky eggs around that time.

Have to be honest, no I haven't looked at dates. I only buy one bag at a time to keep it as fresh as possible.

 

[Stepnout]

Feed dates are hidden on the tags where I get my feed. I have to call the mill and give them the lot number to inquire about the date. It’s the only place to buy feed here.
The feed store says they receive new feed fresh every week. By the all the traffic through there I tend to believe them. The feed always smells nice and fresh.