Michigan has ~300,000 dairy cows, ~100,000 beef cows, and around a million pigs: https://www.michigan.gov/documents/deq/deq-ogl-sbci-MI-Livestock_204805_7.pdf h

Michigan has ~300,000 dairy cows, ~100,000 beef cows, and around a million pigs: https://www.michigan.gov/documents/deq/deq-ogl-sbci-MI-Livestock_204805_7.pdf https://www.michigan.gov/documents/deq/deq-ogl-sbci-MI-Lives... This document also discusses manure and runoff problems, although not in much detail, it looks to be a PDF of a slide show. Lake Michigan borders Wisconsin, a state known for animal husbandry.