HiEverybirdy
Crowing
Sorry to hear this didn't clear up! Time is important with chickens, and the longer things get pushed out, the more issues can pop up in a vulnerable bird's system.
None of us can tell you if it's Marek's or not, but, for sure, being dehydrated or malnourished for over a week can cause a host of other problems, including progressive neurological symptoms.
As @Wyorp Rock said, vitamin supplements can contradict Corid (frustrating, because I know you want to get her as much nutrition as possible). I actually think this is why cocci snuck up on our chick last week, even though the babies were on a preventative dose the prior week because of our soil's history: I was still giving them a supplement I suspect contradicted Corid's protection, ugh.
Just a thought: when a bird doesn't rebound in 12-24 hours, I find a vet who will do a fecal analysis on chicken poop <--many non-poultry vets will agree to this. This test doesn't provide all the answers, and false results can happen, but it's a relatively inexpensive way to possibly get life-saving insight, like if there really is a big coccidiosis load or internal parasites.
Your girl may also simply be having problems connected to her being the runt, like a weakness thanks to genes, or malnourishment of her mom, or a faulty incubator...or she may have eaten bad food or a poisonous plant...Marek's is just one of many conditions that can cause her symptoms. Poop photos and answers to questions from @Swbertrand1 and @Wyorp Rock may help others here provide more insight. Continued good thoughts your way!
*Edits to fix my typos
None of us can tell you if it's Marek's or not, but, for sure, being dehydrated or malnourished for over a week can cause a host of other problems, including progressive neurological symptoms.
As @Wyorp Rock said, vitamin supplements can contradict Corid (frustrating, because I know you want to get her as much nutrition as possible). I actually think this is why cocci snuck up on our chick last week, even though the babies were on a preventative dose the prior week because of our soil's history: I was still giving them a supplement I suspect contradicted Corid's protection, ugh.
Just a thought: when a bird doesn't rebound in 12-24 hours, I find a vet who will do a fecal analysis on chicken poop <--many non-poultry vets will agree to this. This test doesn't provide all the answers, and false results can happen, but it's a relatively inexpensive way to possibly get life-saving insight, like if there really is a big coccidiosis load or internal parasites.
Your girl may also simply be having problems connected to her being the runt, like a weakness thanks to genes, or malnourishment of her mom, or a faulty incubator...or she may have eaten bad food or a poisonous plant...Marek's is just one of many conditions that can cause her symptoms. Poop photos and answers to questions from @Swbertrand1 and @Wyorp Rock may help others here provide more insight. Continued good thoughts your way!
*Edits to fix my typos
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