A major problem of finishing swine in confinement is getting the manure out of the building.
Van Fossen, Larry D.
"Problem: How To Get Manure Out of Swine Finishing Buildings One Answer: Deep, Narrow Gutters,"
Iowa Farm Science: Vol. 19
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol19/iss8/3