I have been using Golden Valley Apple Cider Vinegar for 10-12 years now. The enzymes in raw, un-pasteurized vinegar help our farm animals breakdown the stored forages we feed this time of year. In Minnesota, one ounce per 200 pounds of body weight helped a group of grass finishing animals consume 20-25% less feed while still maintaining their same rate of gain.
One of my "sister" websites Campbells Daily Apple tells the whole story. You might consider give it a look and perhaps trying out some of the Apple Cider Vinegar products I have for sale on that website.