Many Iowa hog producers have been getting good gains on their hogs the past 2 years with less protein in the rations than the amount that's been recommended.
Catron, Damon; Jensen, Aldon; Maddock, Helen; Ashton, Gordon; and Homeyer, Paul
"Hogs Need Protein With Balanced Rations,"
Iowa Farm Science: Vol. 6
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol6/iss9/2