I was thinking the same thing. Nature will take of these critters soon enough. It may take a while, and will stink for a good long while, but it will get done.
On the other hand, blowing up a frozen cow *is* kind of a cool idea.... ;-)
I'd bet there's an Air Force base within easy flying distance whose pilots could benefit from holding a live fire exercise. Two birds, six cows, one (HE) stone. :=)