I am not a hay expert, but many animals appear to be. Today I placed about 10 bales of straw bedding around the sows to dry things up a bit. They immediately started flipping out, tossing it around, and voraciously devouring it. For a while they all had green\yellow Santa Claus beards as they carried around flakes of the stuff. They ate themselves into a food coma and passed out in their own plate (see picture). It was hilarious. What is strange is this was straw bedding. I have purchased "quality" alfalfa for four times as much, and they did not turn into hammerhead land sharks. Goes to show that there is a science to grass, and animals can tell (whether they know it or not), if it was grown in a manner that is good for them. Next time I buy hay, I may take one of the pigs with me just to be sure I get what I am intending to.