missing feathers, thin shells

[Heidi-Ho]

I have 10 hens: 4 Araucanas, 4 Barred Rocks, and 2 Lace Winged Wyandotte's.
They were hatched March 2019 and layed 7-11 eggs daily. This year I'm getting 4-8 eggs daily
I feed a popular chicken feed with oyster supplement. They also get fresh leftovers of meats and vegetables and chicken scratch grains.
For a couple of months an occasional egg from the BR or LWW (its always a brown egg) has had a very thin or almost non existent shell.
They other day I noticed 2 of the Barred Rock hens are missing feathers along the breast bone and the skin is red (not sure if that is normal).
All the other chickens appear fine and healthy.
Do I have a problem and what is it?

 

[FluffyButtBabies]

Can you post pictures?

 

[Heidi-Ho]

I have 10 hens: 4 Araucanas, 4 Barred Rocks, and 2 Lace Winged Wyandotte's.
They were hatched March 2019 and layed 7-11 eggs daily. This year I'm getting 4-8 eggs daily
I feed a popular chicken feed with oyster supplement. They also get fresh leftovers of meats and vegetables and chicken scratch grains.
For a couple of months an occasional egg from the BR or LWW (its always a brown egg) has had a very thin or almost non existent shell.
They other day I noticed 2 of the Barred Rock hens are missing feathers along the breast bone and the skin is red (not sure if that is normal).
All the other chickens appear fine and healthy.
Do I have a problem and what is it?

 

[FluffyButtBabies]

She most likely has mites. The thin shelled eggs might have something to do with that, or it might be a separate issue. For now, treat for lice/mites, and then see if the egg problems and other symptoms leave. If not, then we'll try to figure it out then.

 

[Heidi-Ho]

View attachment 2259239

 

[Heidi-Ho]

Is it likely that only 20% of my hens have mites? What is your choice of treatment? Thank you!!!!!

 

[FluffyButtBabies]

If one hen has mites, they all do. They just haven't shown any symptoms yet. I like using Elector PSP because you can keep eating their eggs while on treatment. But it's PRETTY expensive, so a much cheaper option is Pyrethrum Dust. You should also clean their entire coop out, and provide them with a nice dust bin/bath area. After you eradicate the mites, they'll use the dust bath to keep them away.

 

[hayley3]

I have 10 hens: 4 Araucanas, 4 Barred Rocks, and 2 Lace Winged Wyandotte's.
They were hatched March 2019 and layed 7-11 eggs daily. This year I'm getting 4-8 eggs daily
I feed a popular chicken feed with oyster supplement. They also get fresh leftovers of meats and vegetables and chicken scratch grains.
For a couple of months an occasional egg from the BR or LWW (its always a brown egg) has had a very thin or almost non existent shell.
They other day I noticed 2 of the Barred Rock hens are missing feathers along the breast bone and the skin is red (not sure if that is normal).
All the other chickens appear fine and healthy.
Do I have a problem and what is it?

Have you seen the BR or LWW panting? I've read many places that excessive heat causes low calcium levels and thusly the egg shells will be thinner.
Have you looked closely where their feathers are missing to see if you have mites? Do they have a dust bathing area? That normally helps with mites and such.