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I have no experience with it but I have made beef jerky and venison jerky (very beef like) and I assume horse jerky will work the same.
I don't know what the meat taste like so I can't steer in you in any specific directions for that meat but I would think you can use a general run of the mil beef jerky spice/marinade and that should work fine... the problem is finding a good one that is simple and people stand behind to use as the internet is full of a lot of bad recipes.
I'm sure something on this forum would be easy to find and use :)