How does pemmican not go rancid?

Kento Nanami

Culinary Explorer
What doesn’t pemmican spoil? Whey I can’t help but wonder how one may preserve pemmican and make it last longer? What measures or procedures make it to have a long shelf life? I’d love to know the scientific approaches towards the preservation of the species. Looking forwards to exploring this part of food storage as a concept.
 
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