In my reasoning, there is nothing ruling out Bozie possible producing another calf. Sure, she's 39 and not of ideal age associated with reproducing females but to be realistic and honest, there aren't many viable reproductive females left. And the ones that are will be females we will have to wait to reproduce once the reach he appropriate age, meaning all of the other females will have sadly passed.
However, back to Bozie. Sure her last calf was a while ago but, (not for sure) but I'm assuming she has no cysts in her reproductive tract or any other aliments that otherwise would not allow her to conceive. Take Rasha at Fort Worth for example. She was 43 and had her newest calf over this past summer and her last calf was Bluebonnet 16 years ago.
I believe it could be done, and then to also hear the rumors Shanti was artificially inseminated disapproves any doubt. However IF any breeding attempts were made with these two females, Bozie and Shanti, i believe now is the time.
On regards of the bull, I'm honestly glad Spike went to Tampa, theres a reproductively viable female there who will provide spike to pass his genes into another gene pool other than sending him to Washington and breeding with Rani again. I've somewhat lost hope in that pairing. But Washington's Zoo is our National Zoo and notoriously known for their conservation work, if any Zoo were to sucessfully import a Bull i believe it would be them.
If captive populations were their only option, I believe Kanduala should be sent off to breed elsewhere as he will be related to Shanti, Rani, and Kamala. If i could choose i would send him to ABQ, and send 1 of ABQ's bulls to OKC.
Sorry again, these are just some of my thoughts on their situation. I'm interested on what all will unfold in the future.