What I have read is that if you are feeding wild pig, it is essential that you freeze the meat for a couple weeks at 0 degrees f. Or longer if your freezer is not that cold. If you are feeding conventionally raised pork, they have never touched the ground and are not likely to have ever even been exposed to the parasites you are trying to kill, so you aren’t supposed to have to worry about it. I choose to be more cautious, and I still freeze conventionally raised pork. I don’t really trust people who would raise pigs that way to always do the “right” thing. And as much as possible, I try to buy pasture raised pork anyways, which means it has to be frozen.
