Conversation so far:
Tell me about the historical context of Christiaan Barnard.?
Barnard had experimentally transplanted forty-eight hearts into dogs, which was about a fifth the number that Adrian Kantrowitz had performed at Maimonides Medical Center in New York.
Were the transplants mostly successful?
Barnard had no dogs which had survived longer than ten days, unlike Kantrowitz and Shumway who had had dogs survive for more than a year.
Were these controversial?
CANNOTANSWER.
Are there any other interesting aspects about this article?
On 23 January 1964, James Hardy at the University of Mississippi Medical Center in Jackson, Mississippi, performed the world's first heart transplant and world's first cardiac xenotransplant.
Was it successful?
CANNOTANSWER.

Question: Have there been any other similar transplants or surgeries?
Self-contained rewrite: Aside from the world's first heart transplant and world's first cardiac xenotransplant, have there been any other similar transplants or surgeries?