I just bought 10 Partridge Rocks and 8 BLR Wyandottes 7-8 months old. I brought them home and put them in 2 seperate coops away from chickens that I already have, just incase they had something that wasn't showing yet. One hen got to where she couldn't walk about 1 1\\2 ago, and now 3 have died, and one more is showing the same symptoms of not being able to walk and having no balance. The three that died never showed any symtoms, and the first one that can't stand has shown no response to antibiotics. She can't keep her balance and can't stand up and walk around. We thought she had broke a leg or both legs, up high were they join her body, but now we think it is something else. Can anyone Help?? I plan to research it but would like some advice if anyone has it.