Description given on Youtube:
The improvement of the genetic make-up of Australia’s cattle herds with breeds such as the Boran and the Tuli from Africa has been a major aim of CSIRO researchers.
But importing new breeds of cattle into Australia from Africa, where animal disease is rife, is impossible. So the researchers collected embryos from selected stock in Africa, froze them, and took them to Cocos Islands, Australia’s off-shore quarantine station. There, they were implanted in Friesian surrogate mothers, flown from Australia especially for the task.
After 74 successful births, the young Boran and Tuli calves were tested for disease before being landed on the mainland in March 1990.
Video transcript available here: http://www.csiro.au/news/transcripts/YouTubeTranscripts/2014/Oct/Cattle-out-of-Africa.html