Twenty million hogs a year in Iowa alone- that's big business. But, efficient competition from other meat-producing animals, especially broilers, is forcing more specialization, increased application of research findings and increased efficiency in hog production.
Catron, D. V. and Hazel, L. N.
"Your Hog Business of the Future,"
Iowa Farm Science: Vol. 10
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol10/iss3/2