Donkeys originated in Africa?

http://www.abc.net.au/science/news/stories/s1134709.htm
"Researchers used an increasingly popular method called a genetic clock, in which genetic mutations can be calculated for each generation, and then generations of two separate species can be counted back to a theoretical common ancestor".
"African wild asses were probably tamed not once, but twice, in locations far apart to become the willing donkeys that carry loads the world over, an international team of researchers says." In Egypt the earliest donkey remains date back to the early Neolithic of Lower Egypt.