Popping in here for an update. I drove to Gonzales this morning to the Texas A&M Poultry Diagnostic Lab (it took about 1.5 hours to get there). The director/vet, Dr. Ficken, came out to get the info and history from me while the person behind the desk was getting my other info. He was great - we talked through what I had seen in Paula's necropsy, and then (since I had told him I was a human pathologist) he told me what findings he would look for that would indicate Avian Leukosis vs. Marek's. He started on it right when I left, and he called me on my phone with results before I even made it back to San Antonio! (That's quick service!).
Preliminary findings indicate it was Avian Leukosis (NOT Mareks). From his description, she looked very similar to Paula - he's sending me some photos. I asked him to go ahead and do histopathology just to be thorough.
I need to digest this and its implications for my flock, and do some more reading. This is the classic time (14-16 weeks or so) for congenitally infected chicks to manifest and die, and babies reared with congenitally infected chicks apparently also have a high likelihood of developing tumors - I may lose all the CL girls in that pen, not sure about the two Aloha Naked Neck girls in there, as they were not put together until 4 weeks old, and they could be more resistant anyhow. Again, I have more reading to do, not sure I will go straight to culling (yet). But I am not going to put any of those girls with other birds. The mercy here is that I had never desired or planned to sell hatching eggs or chicks.
What a drag - but I'm very glad to have gotten the necropsy and to know that I was wrong and it's not Mareks.
- Ant Farm