I had a rooster that was whistling a bit when he was breathing and thought maybe he just had a cold. Now found a hen that was gasping for air in the coop and took her out and started her on medicated water, but she died last night. To my surprise, living in a rural community doesn't mean the vets in the area are going to know what to do with your chickens. I am starting the rest of the flock on Tetracycline in their water today to try and stop any others from coming down with this. Does anyone have any thoughts or help??