So many questions. Have you asked how much a simple DNA test on a tissue sample for the main avian viruses would cost? If it comes back positive or "likely", then you might assume dietary causes by default.
Edited:
My brain did it again. I meant if the test come back negative for avian viruses...
Gout is rare, but when it occurs, it's often from feeding a diet too high in minerals in addition to high protein. That can happen when people put vitamins and electrolytes or copper sulfate in the water on a continual basis to deter crop yeast.
Sticking to a balanced commercial feed and...
No. Starter feed does not cause liver damage over such a short, short term. Starter (chick) feed actually has lower percentage protein than an all flock or grower feed. I feed all flock to my new chicks, and have been for years, without any related health issues. Many people dispense with chick...
You can easily test a chicken for blindness. Each eye sees independently of the other. The right eye sees close up and the left eye sees distant objects.
Test each eye separately. To test close vision, sprinkle his favorite treat in the ground and let him find it. Do this without the other...
Please do continue all further developments on this thread. If you decide to post necropsy photos, it's helpful to edit (or have the mods do it) your thread title to include that necropsy info has been added.
Many people who live on BYC forums don't realize that other search engines pick up...
You would have to talk to the lab. Many have restrictions on how long after death they will do a necropsy. My take is, if the remains have been refrigerated from the time the chicken dies, until the remains are delivered to the lab, it would seem they can still run samples of tissue to determine...
You can do a make-shift necropsy yourself. Cut the chicken open as you would to butcher. Sort through the organs and see if they are normal size. The cockerel that was necropsied in my flock to determine leucosis had a two-pound liver. I think you would be able to notice that sort of anomaly...
Could be an avian virus in the flock. It would be a very good idea to take one of these dead birds to a lab for a necropsy.
I have lymphoid leucosis in my flock, and it can kill as these birds have been.