TO GO WITH AFP STORY BY MARLOWE HOOD and PASCALE MOLLARD (FILES) This file photo taken on June 16, 2014 shows four white heifers, "genetic twin sisters" produced using cloning technology, from a very elite Shorthorn cow in the US, at the headquarter of Trans Ova Genetics in Sioux Center, Iowa. Two decades after Scotland's Dolly the sheep became the first cloned mammal, consumers may well wonder whether they are drinking milk or eating meat from cookie-cutter cows or their offspring. The fact is, there is no way to know for sure, say the experts, even in Europe, which has come closer to banning livestock cloning than anywhere else in the world. But there is one sector in which Dolly's legacy is alive and well: the duplication of prize breeding animals. / AFP PHOTO / Juliette MICHELJULIETTE MICHEL/AFP/Getty Images
