The 1956 spring pig crop for the United States is 8 percent smaller than the 1955 crop, according to USDA's June 1 estimate. The 1956 spring pig crop includes those pigs farrowed during the 6-months period of December 1955 through May 1956.
Iowa Farm Science Editorial Board
Iowa Farm Science: Vol. 11
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol11/iss2/6