Recently, there has been some concern about energy utilization in agricultural production. Shortages of natural and LP gas have affected many livestock producers, especially swine producers utilizing LP gas as a supplemental heat source in farrowing facilities. These shortages, coupled with an ever*increasing price for fuel and electricity, have encouraged many producers to begin looking for ways to reduce energy consumption.
Fehr, Robert L., "Energy in Agriculture: Energy for Swine Facilities Part I: Energy Conservation" (1978). Agricultural Engineering Energy Series. 34.