Our local feed mill guy said the moths are from wheat and come in from the field, and it can happen to very fresh feed. He said they run wheat through the equipment, some of the moth eggs end getting into other feed, and voila, you have larvae and moths hatching in other feed (they end up in my horse oats). They ARE yucky, but I personally wouldn't worry about feeding them to my chickens. It's just extra protein.
Moldy feed is quite a different thing, I wouldn't feed moldy grain to any of my animals.
Moldy feed is quite a different thing, I wouldn't feed moldy grain to any of my animals.