To be quite frank, I have no issue with geriatric cows going to TES. They’re a dead end breeding wise, can be socially problematic, and honestly, they’re an expensive burden for whatever facility ends up taking them on, with very little reward besides simply “having another elephant”. Most older cows, simply due to the management style that was so popular when they were younger, are riddled with arthritis and other various health issues that are not cheap to help maintain. Any animal that goes to TES will never leave that facility so it’s not like there’s any concern of TB spread to other facilities, and honestly given the space and habitat the animals have access to, it’s really a better retirement facility for an able bodied animal more than any zoo can offer at the current moment. They’re an excellent dumping ground for animals that would otherwise take up space that could be used for bachelor holding within the AZA.
Look at Oklahoma City, for example. They took Bamboo and Chai from Seattle (a move to this day I still think was a very poor decision), and what did they get in exchange? Both of them passed away within 7 years, leaving no term long positive effects on the herd, and moreover, they *directly* lost their oldest female calf, Malee, because of the two older cows being transferred there. She succumbed to EEHV-HD, but it was a highly lethal strain uncommonly found an Asian elephants, but that the Seattle cows were known to carry. If they had never been sent there, OKC could’ve very well had another young, potentially breeding cow still alive, who at this point could’ve had one or two calves of her own. Instead Malee died, both old cows died, and OKC has another strain of herpes virus to worry about. Neither Chai nor Bamboo ever integrated into the herd well either, so it’s not like there was really any social benefit for them going there either. Had they gone to TES, their lifespan likely would’ve remained the same, but the reproductive population of Asian elephants in North America likely would’ve been infinitely better off because of it.