I'd wonder about vertical transmission of a Mycoplasma (hatched from breeder's eggs?). Hoping you don't lose another but, if worse comes to worst check this thread for pics of what one would look for to make tentative Dx of Histomoniasis (Blackhead). https://www.backyardchickens.com/forum/viewtopic.php?id=529870&p=1
Someone else might know (have experience) worming young turks with Valbazen.
Wish you the best of luck!
(check with state vet lab/Univ. vet path lab for cost of testing - might be closer)
Someone else might know (have experience) worming young turks with Valbazen.
Wish you the best of luck!
(check with state vet lab/Univ. vet path lab for cost of testing - might be closer)
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