Nubian Wild Ass in Zoos?

The Wiki article doesn't say those animals were introduced, B&B did. Not sure what source I used for that portion of the article as there doesn't seem to be a reference for it anymore for some reason.

I don't think that is at all a correct statement. While yes zebras are much more common in captivity (with six taxa being actively kept and bred across the US and Europe), there are existing breeding programs for Kulan, Kiang, Persian Onager, and Somali Wild Ass. The former two are more or less Europe-only (apart from the odd animal here and there), but the latter two are kept and bred in both regions. Persian Onager is certainly much rarer in US zoos, but there still is a studbook and more than just Columbus keeps them.

~Thylo

 

In the boek "Het Artisboek" from 1922 I found a nice picture of a pure Nubian wild ass with her foal and a third animal kept in an enclosure next to it. In the text it is said that this subspecies was repeatetly bred and on Zootierliste its said that one Artis-bred animal ( born 1901 ) lived until 1925 - a record-age for this subspecies.
Because there are no copyrights anymore on this publication I feel free to upload the picture of the 3 animals ( photographer A.J.W de Veer ) :

 

Next door: Przewalski's horse perhaps?

 

I would like to show you this picture of a Simoli-land wild ass in Koelner Zoo in Germany from 1894.
(Found this by accident in the Artis - repository)

Dierentuin van Keulen, wilde ezel van Simoli-land

Quite interesting!