The land area devoted to the cultivation of genetically modified (GM) plants has increased in recent years: in 2012 such plants were grown on over 170 million hectares globally, in 28 different countries, and are at present used by 17.3 million farmers worldwide. The majority of GM plants are used as feed material for food-producing farm animals. Despite the facts that GM plants have been used as feed for years and a number of feeding studies have proved their safety for animals, they still give rise to emotional public discussion. This paper reviews and discusses the results of recent experiments on the effects of feeds derived from genetically modified plants (GM feeds) on the physiological and metabolic indices of livestock, poultry and fish. - See more at: