Thanks so much for the reply. You really sound like you know what your talking about. I've never given ANYTHING a shot.. but ill do it I guess.
After reading some of the older post I think that may be what it is that I have irratated their respiratory with the dust. we also Sunday changed to pine bedding in the coop and the run, and being concerned about lice I used DE and spread it all over their bedding , in the nest and in the pen so they could get it on them when they dust bathed. So I think maybe the combination of those changes has irratated some of them. Im freaking out! What signs should I look for tha will tell me they are worsening. I have children and normally you look for runny noses a, lethargy and coughing and a fever. Well you cant tell if chickens have fevers so Im just gonna use my instincts.
Ill get some tyan as you said just in case.