I was just reading an article on yahoo about why Americans gain weight and the first section talks about fast food hamburgers and how they are made (gross). It says that most hooves and heads are used for pet food and cooking oil?? does anyone have any idea as to what oil are they referring to? I tried to google search about it but got no where. I don't want to use oil made of hooves and heads! below is the article. Thanks for your help!