Sunday night I had noticed two of my D'Uccles (7 months) were sneezing quite a bit. Monday morning I went out to put electrolytes in their water and now 3 or 4 more birds are sneezing and having a tough time crowing. Nothing else seems wrong with them. I did some research and found out that it could be caused from the fresh straw bedding I just put down for them. Last night I turned a heat lamp on for them and gave them some apples. Is there anything else I can do for my chickens? Will they be ok?