We are having a problem with our chickens, we have about 20 hens 3 roosters and 5 guineas. We keep them up at night and let them out about 2 hours daily and out on weekends. It seems they are slowly dieing 1 a week. We put apple cider viniger in their water and feed them bought corn and grain. They are laying good and all seem fine. We found 3 dead under where they pearch for the night. The next victim is a nice plump hen, she is walking around in a daze and will not get on the perch. We noticed her this evening, this is the first sick one we have seen, the others we just found dead. The weather here is cold and hot but the next few days will be in the 30's dipping down into the teens. We have had lots of rain for the last month or two and warm temps. Thanks for any help or input! They are all young chickens, been laying about two months maybe a little longer. Also we found no markings on the dead hens no blood or bites.