I was reading about making gut strings for stringed instruments where it mentioned that a sheep has about 30 yards of it. 90 Ft. would make alot of cordage.

Has anyone heard of how to field prosess animal small intestine for the use of cordage? Possably along the line of brain tanning the hide?

Salt was the only preserative that I have read about so far but in a survival situation, I doubt one would have much salt on them.