Chinese scientists have genetically modified dairy cows to produce human breast milk, and hope to be selling it in supermarkets within three years.
The milk produced by the transgenic cows is identical to the human variety and has the same immune-boosting and antibacterial qualities as breast milk, scientists at China's Agricultural University in Beijing say.
The transgenic herd of 300 was bred by inserting human genes into cloned cow embryos which were then implanted into surrogate cows.
The technology was similar to that used to produce Dolly the sheep.
"It's good," said worker Jiang Yao. "It's better for you because it's genetically modified."
The scientists have also produced animals that are resistant to mad cow disease, as well as beef cattle that are genetically modified to produce more nutritious meat.