I think it sounds like they have an infection that may be overwhelming them and killing them. I would be treating them all with Tylan or some antibiotic before it takes them all.
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I heard from a friend that a possible treatment is puttingg "tryamieasine" in the chicken's water for a week. I've Googled "tryamieasine" with no results, so I'm thinking he may have misspelled it.
Anyone know what he is referring to? He says in comes in little packets, so it must be a powder, and runs about $3.50 a packet.
Any ideas?