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. 2014 Feb 24;9(2):e89870. doi: 10.1371/journal.pone.0089870

Figure 1. Hog production in the US: Number of operations and mid-aggregate enterprise size; 1987–2007.

Figure 1

Data from the United States Department of Agriculture (USDA) shows the decline in number of hog operations and growth in operation size from 1987 to 2007. Sources: The Changing Organization of U.S. Farming, USDA Economic Research Service (http://www.ers.usda.gov/amber-waves/2011-december/changing-farming-practices.aspx#.UgqVWOu9xEo) and USDA Census of Agriculture QuickStats, various years (http://quickstats.nass.usda.gov/?source_desc=CENSUS).