I bought a bag of Cluck & Co layer feed for my chickens because it was on sale but they weren't quite at the right age yet so I was going to save it until they were, but I forgot the bag in the trunk of my car and it's been quite hot lately (70s/80s). The bag was not opened yet but now I'm wondering if the heat could make it go bad? I don't want to feed it to them and get them sick!