I know ,Al Wabra is keeping Beira ( they are not doing well there, a lot of them died and I don't think they will send Beira to other facillities )and Phillips Dik-Dik, but Al wabra is not a zoo and not open to the public, so it's impossible to see them. The Jentinks Duiker at Brownsville is the last one in a zoo, and and the last Bushbucks at Brownsville is the last group of them outside of africa and they will die out there.
There is one Dibatag in a breeding facillity in eritrea.But its not open to the public,too.
@Okapikpr. There was an quarantine station at naples, but it is closed since many years.