Curved breast bone

[Chickalettas]

Does anyone know if this is normal? Their breast bone is curved.. The first picture was a chicken I had to cull because she had tumors. This morning I found one of my chickens dead in the coop and when I de-feathered her, she also had a crooked breast bone. I’m wondering if this is normal. I bought all my chickens when they were already grown so I don’t know how they were as chicks or if they had any previous problems.

 

[nuthatched]

I wonder of it was broken and healed funny. Does the bone seem thicker or calloused there?

 

[coach723]

I've had a couple of birds with curved breast bones, one was barely noticable, one was pretty severe, bent into a C shape. They both were hatched here and had to be assisted to hatch, so likely malpositioned in the egg. It was probably either the malpositioning or a genetic or developmental abnormality that caused it. Incubated chicks seem to have a larger number of issues. Probably had no real effect on their life, but I would not hatch eggs from those to prevent possibly passing it on to young.