3) Pesticides, herbicides, etc. Commercial production allows for the use of these chemicals, both directly on the animal (insecticides and parasitides) and on the feed they eat (herbicides for weeds, pesticides for bugs, fertilizers for growth promotion). These are all regulated by the USDA, but as someone that has been involved in agriculture all my life, off-label and mis-label applications occur. In organic production, none of these things are allowed (although I know "cheating" occurs). Neither the animal nor the feedstuffs may be chemically treated under organic production.