The chickens were hatched form my Granny's chicken eggs that she has. She does this very frequently. The feed is something Ranch, we get it at Atwoods and I would not think there should be any mold we buy, open, and pour feed into a barrel with a tight lid. Some of the other chickens from the same hatch are doing great and eating the same brand feed, which is done the same as ours. Them chickens are at the maw-in-laws about 4 miles down the road from me. My chickens are drinking well water not sure if that could be it or not, but they have always drank the well water and just started getting sick a week and half ago, also I drink the well water. Thanks for your continued help in trying to figure out what this could be, my 2 boys are not liking their chickens being sick and dieing.