I definitely wouldn't turn down this experience for the potential maybe of getting something more zoo related next year. You don't know if that's going to happen. Now, of course if there was some zoo project that you're considering right now too, that's a different situation, but it doesn't sound like the case. Research experience is still good even if it's in a distantly related field. The skills you acquire through the experience will be beneficial, so will being published, and it's just one of those things where it's generally useful to have those doors open.
All that being said, you absolutely should look into getting involved in the zoo field specifically as well. It doesn't have to be through that same program. You do have an ACZM diplomate at Iowa State - I would reach out to her for advice. Even if she doesn't have something herself you can work on, she may have contacts she can put you in touch with. If you've got exotics/zoo clubs, get involved there. Leadership positions in those organizations give you an opportunity to network with potential guest lecturers and such. If you have the extra funds, join the relevant organizations and consider attending conferences. More networking, learning about things that aren't touched on much in vet school, and it'll be good to have on your CV as evidence of your dedication to the field.
Note that I'm speaking from the position of a vet doing PhD research in wildlife health, so this is based on advice I have been given in pursuing zoo medicine, not on personal success in doing so since I'm not at the internship/residency application part yet