That Food We Waste--the Cows Eat It?

CNN has a report on farmers feeding candy to their cows, given the high price of grain.  They play it for laughs, but the main stream media and food movement have made a big deal out of all the food we waste.  I wonder how much of it, particularly from supermarkets, ends up in pigs and cows?

I know a couple of bloggers who raise pigs who feed such things (mostly dairy-oriented, like butter milk etc.).  Does that constitute waste in the statistical business?  I suspect probably it does, but am not sure.  Does it constitute real waste--not to me.