There's not many slaughter house scenes due to farmers being forced into privacy. Only a few disobeyed their companies to show how they make a living, resulting in them losing their contract.
Plant genetics is a billion dollar industry that most people don't even think about. The amount of work and stress that goes in to getting just the right breed of corn (what i studied for a semester) can take years and years. There better be a patent.
The problem farmers have with this is it's nearly impossible to find seed without a patent. If they're using a patented seed, it's through a contract, an incredibly sour one that requires them to loan hundreds of thousands of dollars to continually upgrade their farm.
Not only that, but their crops are at risk of being contaminated by a patented gene. That happens to farmers neighboring another farmer's crop with the patented gene, the wind can carry the seeds to their neighbor, resulting in them growing the patented plants. Those company's keep a close eye on their farmers and when they find other farmers using their patent, even when not by choice due to their neighbors, they have oodles of lawyers at hand.
It's not so much that the billion dollar industry needs to be protected. The way we rely on the corn and soy industry is amazing...It's literally in a majority of food products. There was the huge ecoli problem which stemmed from cattle being fed corn, instead of what they naturally eat, grass. They can't digest corn properly and as a result there's much more manure, combine that with huge crowds of cows and they become covered in shit. The slaughter houses are mass production butcher shops, the largest in the world being in the US. When cows weren't totally clean of their feces, the bacteria went with the meat into our grocery stores, when it wasn't cooked thoroughly people became sick and even died across the country. That resulted in the biggest recall ever seen.
The problem isn't exactly this, it's how to stray away from the mass production of our food. Something no one has been able to figure out. I'm in no way condemning people from eating this kind of food, we do have a choice but it's not easy and it seems impossible on a global level. That's what this movie shines a spotlight on.