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no apology necessary. I really don't know of anything that works for toxins besides activated charcoal, and I can't imagine how you could get that down a chicken. But you could have a really good look on the ground and wherever they range for any potential spills of chemicals, applications of...

I said it does not sound like a deficiency to me. Rather some sort of poisoning.

This doesn't sound like a deficiency to me, more like something toxic (as you suspected with the hen) either ingested or in their environment. Have you tried looking up the symptoms on the vet manual? see e.g. https://www.msdvetmanual.com/searchresults?query=ataxia%20poultry