Livestock production expert witnesses may opine on growth hormones,livestock diseases, and related topics. Here, the EPA writes on Animal Feeding Operations (AFO):
AFOs are agricultural operations where animals are kept and raised in confined situations. AFOs generally congregate animals, feed, manure, dead animals, and production operations on a small land area. Feed is brought to the animals rather than the animals grazing or otherwise seeking feed in pastures. Animal waste and wastewater can enter water bodies from spills or breaks of waste storage structures (due to accidents or excessive rain), and non-agricultural application of manure to crop land.
Read more: epa.gov.