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The pork industry has been modified by a series of innovations in production technologies and now may be modified by changes in the organizational form of ownership. Changes in technology have resulted in a movement of pork production from an uncontrolled to a controlled environment. Confinement structures are rapidly being adopted to house much of Iowa’s livestock, especially hogs.
Iowa State University. Agricultural and Home Economics Experiment Station
Paulsen, Arnold and Rahm, Michael, "Development of subsidiary sow-farrowing firms in Iowa" (1979). Special Report. 84.