
People do all the time, it's better to ensure a lack of human interactive disease (e. coli, salmonella, etc) in your animals than try to kill off all the bacteria in them. We also have ways to test for these diseases with high efficacy so it wouldn't even necessitate the huge amount of antibiotics we pump into these animals.
monoculture agriculture has been the dominant agricultural pattern of europeans since Roman colonialism. european colonialism and capitalism expanded the monoculture to plantations to produce masses of commodities to be sold in markets. glyphosate and other petrochemical derived chemicals boost the productivity of plantations. our modern agricultural and food systems are capitalist in their origin