I never said that the packers owned the animals or the farms. That's not a requirement for an industrial farming model.
What I am saying is that the meat packing industry drove the development of the industrial farm model in the United States, and there was NOTHING like it on the east coast when it came to pig production.
Having an industrialized farming model doesn't mean that you have to have a large conglomerate controlling it. It means that you're focusing on producing one main product, in this case hogs, for one target audience -- the large meat packers.
I agree the meat packers drove to create specialized farms, but probably up until the 1920s-1930 almost every farmer had hogs but probably less than a herd of 20. They were a way to convert corn into food, just didn't have the acreage to support a large herd. It's somewhere around 20 bushels of corn to feed a pig for a year and up until hybrid corn the yield averages were about 25 bushels an acre, so you needed about an acre of corn per pig. Most farms were between 40-160 acres, needed to grow hay for your horses and dairy, oats for horses, grain for chickens, pigs and dairy. Also needed pasture for dairy and horses, so actual acreage of corn was a lot smaller than one thinks.
Back when Iowa was started getting settled in the 1830-1840s by German immigrants, you can read stories about having a crate of piglets hanging from the bottom of their wagon. These immigrants usually started in Ohio or Indiana after getting off the boat and riding the train to the end of the tracks, or ending up at relatives houses in those states. How my mom's family got to Iowa, stopped in Ohio at relatives and headed this way.
I still think pork was easy food (and cheaper) to raise compared to beef, had a source of fat to fry in and similar texture to veal.