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I have some questions to help me best advise you about Coco.
Is Coco from the same hatch as her companions?
Has Coco always been a little smaller than the others?
If not, when did you notice her getting weak etc?
Is she eating by herself?
When you hand feed her, has she a good appetite?
Have they received any worm treatments recently?
Thank you, ***** ***** a couple of things that may be causing this. As she's vaccinated and none of the others are affected, that would reduce the risk of it being salmonella or some other contagious causes. She's also a little old for coccidiosis (though it's not impossible).
When hand feeding her, do you notice a bad smell from her breath or any white dots in her mouth?
What color is her diarrhea?
One last question, what color is her diarrhea?
Thank you. There are a few things that could cause this with kidney disease (likely she would have been born with this) or Newcastle disease (which is a reportable disease) being the most serious for the bird.
I would advise that you speak with your vet about either testing or treating her for coccidiosis.
You're descriptions sound very similar to that (even though she is a little older, we can see it in chickens over 3months if they have a compromised immune system). Coccidiosis doesn't always cause bloody diarrhea, nor is it always contagious.
Treatment for coccidiosis is toltrazuril (Baycox) which is given in water over two consecutive days. It's not an organic product, however, it is the only licensed and clinically proven treatment for the disease. As she is 4 months old, once the withdrawal periods have been observed she could still return to an organic flock.
You're welcome. Hopefully, it's treatable and she is back to herself soon.
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Have a lovely day, good luck!