I've lost
3 out of 7 Partridge Cochins dead, 2 are hanging on, 2 rallied.
1 out of 12 Cuckoos dead, 3 are very sick, 6 more are weak, 2 weren't affected.
4 of 7 Buff Rocks are weak. Of the remaining 3 in the brooder, 1 is weak, other two are OK.
5 of 8 EE are weak, 3 normal
1 of 6 Blue Cochins dead, several were brought into the house just in case. 2 are still in the brooder and appear OK. I think the one that died was just a "normal" die-off and not what is going on with the rest of the chicks.
For us, there is no doubt this is breed specific. The other 6 breeds are fine including 7 white rocks, 7 australorps, 7 RIRs, 11 Red Stars, 27 Bantam americaunas and 12 Blue Andalusians.
So far the replacements are doing well. Lost a blue cochin right away, and still have one weaker Cuckoo Marans, but otherwise they seem OK. They are in the house too.
I am with StormHorse23 on this "wierd disease" thing. It isn't anything I have ever seen before. The ones that have died wouldn't eat. Some of these chicks have a great appetite, will drink when held up, but can't walk. They act like they are drunk or have a damaged nervous system. We have been doctoring on these chicks since the 23rd of February. Of the 25 I brought in, 5 died, 2 returned to the brooder and 18 are still in the house. A normal disease would kill them in a day, not drag on for 10.