I am at a loss with my Polish... I've been reading the prior posts to try and figure out what is going on. THis is our first flock of birds so No experience here! My girls (Polish) are about 8 months old. A few weeks ago we introduced 5 RIR and 1 mixed roo... without isolation... oops! Now 2 almost 3 of my 4 Polish are very lethargic. One has been standing off by herself for about a week and now as of yesterday I noticed she has been puffing out her feathers. Tonight 3 of them are rattling in their chests when breathing. I have not noticed any bloody stools so I'm leaning more towards the CRD because of the stress from the new birds. Anyone have any confirmation for me??? Also, it has been getting colder here. We're in South Central Missouri but it's gotten down to below 30 lately... our run doors are not closed off but we have 8 foot walls and ventilation up high. There is no ammonia smell at all. I use the dep litter method with pine shavings. Who knew chickens could get stressed!