We are new chicken owners. We built our coop about 5 weeks ago from an old shed. We started our flock with 2 sexlinks from the feed store and 2 Easter Eggers and a salmon favorelle rooster. Then we got a mixture from a local breeder. The first chicken that died was a couple day old Cochin baby. The next chicken died was a polish (6week old) then a Rhode Island Red (1 week old) then a polish (6 week old) then all of a sudden our salmon rooster died (2 months old) then our silky died (4 weeks old), all of this over 5 weeks. Now our 4 week old Cochin looks sick and so does our 4 week old turkin. All seem to eat and drink and thrive and then all of a sudden they stop eating and sleep all the time. They don't cough or sneeze. Poop is ok sometimes runny no blood. We put them in the coop at night and in a cage outside during the day. We check on them all the time and they are family to us. We started the whole flock on duramycin-10 yesterday. I have tried taking the sick ones out and bringing inside with heat and water and nothing is helping. Please someone help me.