I just received a 250 ml bottle of Tylan 200 and the exp. date is 12/08. I guess I was surprised the exp date is in 7 months. But the information in GoatKeeping 101 says that is okay? The literature says to keep it at a temp below 72*F. Is refrigeration recommended for this product? Kinda a big bottle for my tiny herd. I am batteling a bacterial pneumonia with several kids and the first one sick, after 9 days, still has tiny wet coughs and a yellow snotty nose. So I was thinking I would switch this 21# wether to Tylan 200, have been using PenG. Any suggestions, please??