Sungjo said that there are Factory Farms for the mass production of cheap meat. Where they are put into poor conditions, barely living, just being fattened. chapter 50 page 10
Humans in these farms do not learn a language, no names, no free will and can't think of escaping. If they do, the factory farms are well guarded.
Emma said how awful it is and they do not even get a "fake happiness" like they did with a Mama.
Sonju said there are several hundreds of plantations but only 4 are Plantation Farms of premium quality.