I have a hen who is about 3 years old. She started walking very spread-legged, like a duck, a few days ago. Her poop looks like a hard-boiled egg yolk, and her breathing is labored. After an intensive inspection, she appears to have mites. Another hen died of these same symptoms about 3 months ago, but I didn't notice mites then.
I am guessing, based on the symptoms, that she may have Mareks. I have separated her from the others and when I was carrying her, she had what looked like a seizure, eyes rolled back in her head, neck flexing and flailing, wings flapping. She calmed down and 2 hours later, is still living, but her breathing continues to be very labored.
1. Do you think it is Mareks?
2. What can I do about the rest of the flock, obviously already exposed?
3. I have 5 week old chicks in a separate area with a broody mom.
4. Is she suffering and does she need to be put down? (not that I could do it, but ...)
Thanks to all who read, ponder, and offer thoughts.