Photo taken on Sept. 15, 2015 shows the cloned, genetically modified cow Niu Niu and its calf at the experimentation base of Beijing University of Agriculture in Beijing, capital of China. A cloned, genetically modified cow has given birth to a healthy calf in China, a crucial step toward producing domestic marbled beef. The calf's mother, Niu Niu, is one of two clones born in 2012 with a gene inserted to increase the fat level of their muscle. (Xinhua/Li Wen)