If you're not going to use it immediately, you have to freeze it, almost instantly. Because as it cools, lactobacillus sets in. The grain starts to get slimy and starts to stink to high heaven. Even thawing it out you have to use it quickly.
I once saved 10 pounds in my freezer to take to my then GF's Llamas that she raised. I pulled it out of the freezer about 45 minutes before I left to soften, and it was another 45 minute's drive, and in that 90 minutes it had turned.
Even the llamas wouldn't touch it. In fact, they were so offended by it that they started huffing and puffing which is the sign that they, like camels, will start a nasty spitting attack. My GF yelled at me to back out slowly. It was touchy.
