Stock Photo - Professor Dr. Markus Rodehutscord stands next to a so-called cannulated cow inside a animal testing facility of the Hohenheim University in Hohenheim, Germany, 28 June 2017. Through a hole at the side of the animal researchers can take samples from the cow's rumen. Photo: Michael Hertel/dpa. - Stuttgart/Baden-Württemberg/Germany

Stock Photo: Professor Dr. Markus Rodehutscord stands next to a so-called cannulated cow inside a animal testing facility of the Hohenheim University in Hohenheim, Germany.

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