We have 3 chickens (2 in one flock 1 in another) who are being lethargic and not eating very much. We are currently giving them VetRx orally, we think it's because of the cold (30F with snow and some wind) and we don't know what to do because we don't have anywhere else to put them inside the barn, we cant put a heat lamp in the coop (all chainlink with a small house to lay&sleep in) we might be able to insulate with old horse blankets, sawdust and hay.