Poultry
In some countries, geese and ducks are force-fed to produce livers with an exceptionally high fat content for the production of "foie gras". Over 75% of world production of this product occurs in France, with lesser industries in Hungary and Bulgaria and a growing production in China. "Foie gras" is considered a luxury in many parts of the world, but the process of feeding the birds in this way is banned in many countries on animal welfare grounds.
Fonterra
Fonterra is New Zealand's largest producer of biofuel, processing a waste stream from casein manufacture into bio-ethanol. The company produces around 20 million litres of premium ethanol annually. 
Since 2004, Fonterra has produced ethanol from whey, a by-product of casein, in the Edgecumbe, Tirau and Reporoa plants. That year Fonterra's Edgecumbe plant showcased the power of its biogas, operating a 1.8 litre Hyundai vehicle on a petrol mixture containing 10 percent ethanol. In 2008, Fonterra began supplying Gull Petroleum with ethanol from its Edgecumbe plant.