FYI, I don't know the specifics on corn, but any grain will degrade in nutrition once it leaves it's whole grain form. Either some of the nutrition is removed (as in the bran in wheat) or the act of breaking a grain into smaller pieces will dramatically increase surface area of the grain. This allows both heat and oxygen to more quickly break down vitamins and fats into useless, less desirable or sometimes toxic substances. The more you can protect your feed from oxygen and heat, the longer lasting the nutritional qualities will last.
When I grind whole grains for human use, I store the flour in glass jars and use within two months. They're stored in a cool, dark and dry food pantry. For the chickens, I store their feed and supplements in steel garbage cans, with tight fitting lids and keep the cans out of direct sun.
. I think if I buy one I should probably go ahead and spend a little more on a heavy duty one that will last a long time. If you remember in the future, come back and update how it holds up. Thanks!
