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.
Foie gras controversy
"Until new scientific evidence on alternative methods and their welfare aspects is available", the production of foie gras is prohibited by treaty except for "where it is current practice" among 35 countries bound by the Council of Europe's European Convention for the Protection of Animals kept for Farming Purposes.