Embryo transplant is a similar process to artificial insemination only the opposite and slightly more complicated. Embryos are flushed from a donor cow, fertilized and then either inserted directly into the recipient cow or frozen and transferred later when the recipient cows are in heat.
Here is a video I found with a little bit more information on Embryo Transfer and the process
Transplant is a process that ranchers will use with some of there best cows and embryos can also be sold to other countries. We transplanted about twenty today, hopefully we will get a few good calves from exceptional cows for the 2012 World Hereford Conference!
I also found this article that goes through the process of embryo transfer in more detail with all the steps from selection of the donor cow to transfer of the embryos. http://www.brangusworld.com/documents/Estrus%20Sinchonization.pdf. It may be of interest to some of you that want more information otherwise you can always comment with questions or email me at email@example.com.