If it wasn’t for the fact they specified AZA, I’d say Duncan would most likely be headed to Rockton. He’s unrelated to ALL of their cows, and a good age/size to breed with all of their Jonson daughters.
Here are my thoughts:
Smithsonian: No (Spike is proven and MUCH more valuable)
Cincinnati: No
Oregon: No (He’s too small/young for their only breeding cow)
ABQ: No, for the same reasons as Oregon
Fort Worth: No (Their breeding bull doesn’t have any daughters there)
OKC: No, along with relation to the cows, they already have both Kandula and Bowie
Rosamond Gifford: No for the same reason as Fort Worth
White Oak: Not likely, they’ll want to breed from Casey as much as possible until he can no longer be bred from/passes away, whichever comes first.
St Louis: This one is possible, and hopefully will be where he goes! He’s unrelated Rani, and only a half first cousin to Jade, Maliha and Priya. He *is* a little young/small for all but Priya, I think Baylor would be a better choice simply because he’s older, but still, Duncan is much better than no one.
Denver: Technically possible, as Denver does contribute to breeding via AI. I believe they want to keep their population capped at five bulls right now though. However if someone else (most likely Bodhi) leaves, I would say very likely Duncan could go to Denver.
Tulsa: They’re setting up to breed, and all indication is that they will be using a new bull instead of Sneezy. This is a logical location for Duncan to head to for variety of reasons. They’re fairly close relatively speaking, won’t be in a position for breed for a few more years (giving Duncan time to grow and mature further), and Sneezy could continue to serve as a mentor bull for Duncan in the meantime.