I have 30 chickens, 12 quail, 2 guinea hens, 3 geese and 2 peacocks all at my barn. Only my chickens have died none of my other poultry seem to be effected. I lost 2 2.5 month old Americana's 2 weeks ago, then a 10 month old speckled Sussex 3 days later. This week i moved up 2 one month old standard black Cochin's chicks to a chick pen with 10 chicks that hatched only 1 week before them. My sister stayed up for 30 min to watch them and they were all fine and have 2 heat lamps. They were dead when i checked on them 4 hrs later The next day one of my 3.5 year old black astroloup hens had died. They get fed agway layer feed and some meat bird feed for higher protein, sprouts, bread, veggies and have heated water buckets. I separated my 2 month olds from the flock and my chicks are in wire mesh enclosed pens in a stall. My adults free range and have a stall with many perches, laying boxes (7), 3 feeding stations and a large heated water bucket. All were found on the ground, eyes closed, clear liquid from the nostrils, heavy but not bloated, feathers nice and shiny, no external parasites. It looks like they start walking around and just die? Any advice would be great! I added DE to their feed, electrolytes to their water and new hay on the floor.