Yesterday I filled up my chicken feeder. It is a makeshift feeder that holds about a gallon and a half of food that dispenses through out the week. I have 8 chickens and this set up usually lasts me 4 days until I need to fill it again. But I came out today and saw that the gallon and a half had been eaten in one day the dispenser had some oyster shells in it so that they could recirce calcium through out the week. Should I be concerned they are this much over night. ( due note that there were a lot of fire works going of last night because of Utah things and maybe that has something to do with it.) please help