And you sure as HELL don't use any sort of metallic wire for baling up straw, or oat hay, or alfalfa, or timothy hay, or anything else that might be feed or bedding for any animal - one little snipped off piece of wire accidentally gets inside said animal and you can easily have a sick or dead animal, and/or a huge veterinarian bill for saving or trying to save them.
Hay farmers use sisal or synthetic twine to tie up their bales, and have done so for many decades. You would do well to remember this.
When I do any electrical work in a barn or animal pasture setting I have to be almost paranoid-level careful to not drop or leave any wire cuttings lying around, and make sure the other workers don't either, and they know why - copper wire can do it just as easily as steel.
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