I have a 2x4 x 2 high galvanized tub (like the feed stores) for a brooder. I placed pine shavings in there and once every couple weeks clean it out. The tub doesnt stink, but the chicks smell lol. Is there anything I can do or is this normal? The smell came once they started getting their feathers. Its almost a stinky coop smell, but on the birds lol