Unfortunately, you seem to be objectively wrong.
I know only a handful successful breeding programs for rare species in tropical countries (I mean Latin America, Africa and South Asia outside Singapore and China). Even these usually involve species which breed in Northern zoos too, and, in fact, husbandry was first developed in Europe or North America. One of few exceptions I can think of are pygmy hog in India, Galapagos tortoises and Puerto Rican Amazon in Puerto Rico.
Since animals from virtually every tropical bird and mammal species appear in local zoos as rescues, there should be gazillion of breeding programs by now.
The fact is: low funding, lack of trained staff and lack of infrastructure trump similar climate and low cost.
Any diehard conservationist could count himself/herself - it should be possible to get objective numbers of such breeding programs or reintroductions worldwide and compare.