Farmers in the nine main hog raising states, on March 1, were planning to produce about 10 percent more spring pigs than they did in 1958. These nine states account for about two-thirds of the hogs produced in the nation.
Iowa Farm Science Editorial Board
Iowa Farm Science: Vol. 13
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol13/iss11/6