elephants have been mating in the wild for centuries in topographically varied environments surrounded by rocks and water, they seem to get it right occassionally

the emphasis on AI in North American and European programs, i believe, stemmed from the fact that species coordinators realised that both the elephant populations were moving toward a demographic bottleneck with very little breeding and there were relatively few bulls actually available. in addition, in the 1990s and 2000s when this technology was being developed
many zoos hadnt upgraded their facilities to cope with bulls.
in the last few years many things have changed. females have been consolidated into larger herds, many zoos have upgraded enclosures, cows have improved access to bulls and AI is becoming quite refined. i dont have an ethical problem with AI. i think the development of this technique is one of the biggest benifits for wild elephant management to come out of keeping elephants in zoos.
im not sure which yard melbourne will be introducing its girls to bong-su in, but at taronga i know the intention is to use the new bull facility. i dare say it is likely that at least someone with a bit of life sciences background had some say in the design of this facility which should result in a compound that is suitable for elephant introduction and breeding.
time will tell i suppose, but in summary, if you are attempting an elephant breeding program surely far better to do it in a fenced enclosure than a moated one. and just to get back to the 'open-range' alternative, fences would still have to be used in that case too
