According to Bloomberg Business Week:

"Every horse in the world can be traced to a single mare that trotted the earth about 130,000 to 160,000 years ago, scientists discovered for the first time.

The research identified 18 different genetic clusters that arose from the ancestral mare, suggesting that domestication occurred in many places across Europe and Asia, according to work published today in the Proceedings of the National Academy of Sciences."

Click here to read more about these fascinating findings.