What could be wrong with this chicken?

[froghollowfarm]

I have 2-year-old buff orphington who has been in decline. Some time ago, she began losing tail feathers. More recently, she began walking stiffly and slowly. She eats, but without enthusiasm. Her comb is slightly pale. The other chickens with her seem fine. She and the others eat grain and scratch around in the dirt, but that’s about all. Anyone have any ideas about what could be wrong with her?

 

[CMV]

Give us the following information. The more you tell us, the better we will be able to help you.

1) What type of bird , age and weight.
2) What is the behavior, exactly.
3) How long has the bird been exhibiting symptoms?
4) Are other birds exhibiting the same symptoms?
5) Is there any bleeding, injury, broken bones or other sign of trauma.
6) What happened, if anything that you know of, that may have caused the situation.
7) What has the bird been eating and drinking, if at all.
8) How does the poop look? Normal? Bloody? Runny? etc.
9) What has been the treatment you have administered so far?
10 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet?
11) If you have a picture of the wound or condition, please post it. It may help.
12) Describe the housing/bedding in use