I have quite a backyard flock now... approx 25 chickens, 5 guinea, 4 turkey. For the past 2 weeks Ive noticed some of then hens I rose had bubbly eyes some mucus coming from their nose. Their combs and wattles are normal color.Ive been giving the entire flock water soluble oxytetracycline and sulfamethazine for almost a week now. So far everyday seems different.... one day they have symptoms others they show none and walk around the yard just fine. 3 are showing some respritory problems. Im still learning how to care my flock and questions are suggestions would greatly be appreciated.