A Brazilian cow has been sold for a record $4 million, making it the most expensive cow in the world.

The cow, named Viatina, is milky white and is under constant surveillance, and even has her own bodyguard. She was created by implanting genetically modified embryos to pass on the best characteristics of the breed. Brazil is the world's biggest beef exporter and Viatina's ova have already been sold in several countries.