You can use the cream (or whole milk) to make your own butter as well. You can try it for almost no investment...fill a quart jar about 2/3 full, cap it tightly and shake...and shake and shake. Eventually you'll get butter on the bottom and the buttermilk above it. Alternatively, you can put it in your mixer and just turn it on. It'll go to whipped cream first and beyond that...to butter 
