Experiments with more than 2,000 pigs farrowed at Iowa State College show that corn silage- properly supplemented- makes an excellent and low-cost base ration for sows during pre-gestation and gestation.
Johnson, C. W.; Speer, V. C.; Culbertson, C. C.; and Catron, D. V.
"Corn Silage for Sows,"
Iowa Farm Science: Vol. 12
, Article 5.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss1/5