I bought a bag of feed today with a March 22 date stamp. This made me very happy. But, I couldn't use my coupon for $2 off Purina because there wasn't a sack fresher than Feb 02 and I'd rather not buy feed going on two months old if I can avoid it. They actually had some from AUGUST still on the shelf. I could see that the problem is restocking new on top of old (there were bags from February directly underneath the one I grabbed). It made me wonder, though. Does feed expire? Is there a date where the fats will go rancid in spite of being bagged in plastic and sitting in a temperature-controlled store? If someone buys that August chick feed (shudder), could their chicks actually get sick or is it preserved somehow and not that big of a deal?