This is a species I have already investigated for my ungulates in North America thread. I have identified five remaining holders of the species, with all of the animals belonging to the aforementioned International Animal Exchange, which owns African Safari Wildlife Park in Ohio.
From what I've found, we have:
-3.0 at African Safari Wildlife Park
-0.4 at Zoo Miami
-3.0 at San Diego Zoo
-0.11 at San Diego Zoo Safari Park
-1.2 at Houston Zoo
I've also heard unconfirmed reports of the species still being at Mast Farm, which is owned by the Cincinnati Zoo, though I'm not confident this is the case for the reasons explained above.
What you will see is a suspicious lack of breeding pairs here. From what I can tell the entire population is all directly related to one another and it appears collections are currently no longer breeding them. This is a little confusing, however, given that the species is still an SSP and there are still a decent number of animals left with certainly no less genetic diversity than many other hoofstock populations. I think the major issue here will be IAE, which has complete control over what is done with these animals and where they remain. Unfortunately, I am not overly optimistic for the future of this species in American zoos.
~Thylo