A handout photo made available by the Beijing University of Agriculture showing cloned cow Niu Niu at the school's experimentation base in Beijing on Tuesday. Niu Niu is a genetically modified cow, and is one of two clones born in 2012 with a gene added to augment the fat level of their muscles. She recently gave birth to a healthy calf, which has been seen as a big step towards producing domestic, marbled beef for China.