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Some virus's can be very slow to cause symptoms once infected, individual immune systems vary. It could be something in the environment, possibly a toxin. It's really very hard to say. The labs and examination of organs during necropsy are often the only way to ID things, particularly when...

I agree that a necropsy is probably your best way to know for sure what's going on. Since you've lost three with the same symptoms, it would be a really good idea to find out if it's viral, something spreading in the flock...