Hello, Steve, and welcome to BYC. Good luck in resolving the issue with your hen.
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The CuSO4 I purchased was not acidified. I had to add the acid.Welcome to BYC. The article by azygous is considered to be very helpful. @DobieLover Just wondering, but isn’t acidified copper sulfate already acidified? So why the need to add apple cider vinegar? I thought that was only needed if using plain copper sulfate, (which should never be used without adding ACV or citric acid to it.) acidified copper sulfate dosage is 1/4 tsp per gallon of water for 5 days. McMurray Hatchery has it for around $7.