I had 44 White rocks come in on Dec 16th. Things were going quite well lost a couple as always in the first stages. Significant cold has come and the birds were really huddling to keep warm under the multiple heat lamps I have set for them. I believe this affected their feathering because some have feathered beautifully while others have some real bald patches and parts to their bodies. I lost a couple more here and there and I truly believe it was due to over crowding (suffication) or just getting pushed out of the group on the cold nights however now I have lost 6 in 2 days and I'm starting to wonder if I have disease or if it's just too cold for them. I am doing everything I can to keep heat in my coop but i feel horrible about what is going on. Is there common disease they can get or is it just too cold for these guys? I am in Canada and it has been extremely cold as of late but I have the coop warm enough that water isn't freezing and that kind of thing. Can they get pneumonia? Is there a treatment for the water I can give without tainting my meat? Any help here or ideas of what is going on would be appreciated. They are eating and drinking well. Losing 4 last night is getting me concerned. They are 5 weeks old yesterday.