Very strange about the chicks. The symptoms remind me of what happened to a baby Wood duck that was about a day old when found by a friend. My daughter and I just happened to have a setup for about 18 baby chicks going at the time so the friend asked if we could adopt it. We fixed a seperate little box for it right next to the chicks and it seemed to be a happy little camper....for two days. We gave it the same feed we gave the baby chicks with a little water added to make kind of a mash. It seemed to like it fine. At about 3 days old it started with that lethargy thing then over a couple of hours all the other symptoms you listed and finally the contortions and death. None of the chicks had any symptoms whatsoever and all are well and now 4 months old.
I would love to know what killed the baby duck yet did not cross over to the chicks. BTW, of the 18 chicks, only 6 had been vaccinated. The rest were "packing peanuts".
I would love to know what killed the baby duck yet did not cross over to the chicks. BTW, of the 18 chicks, only 6 had been vaccinated. The rest were "packing peanuts".