I really hope it was a defect. If I lose others, especially of a different breed, and they have the same weird heart, I will be looking more deeply into what it could be.
I think it looks much more like you describe for constrictive pericarditis. It was a quite thick and tough white tissue, not a deposit. I would feel better about that - i.e., less worried it is the diet. Thanks for all the ideas on this.
Just read up a bit on visceral gout. Maybe. It has me questioning calcium consumption. My layer feed has calcium, of course, but my chickens always eat the oyster shell I give them. I put a light colored grit that I have trouble distinquishing next to it when they are not free-ranging, but they...
I fed non-medicated chick starter until POL at about 5 months. Until mid-Dec. I fed layer feed with 19% protein, then replaced a 1`/4 of the layer mix with scratch (which was corn, oats and sunflower crushed). They free-ranged until Dec. and are free-ranging again now. I treat with sunflower...
I had a 10 month old pullet die suddenly today - was fine yesterday. On dissecting her, I found that her heart was encased in a thick white tissue. Has anyone seen this before or know what it is? And her liver was not looking right either. The liver is above and around the heart in this picture.