Dissertation/Thesis Abstract

Energy and nutrient cycling in pig production systems
by Lammers, Peter J., Ph.D., Iowa State University, 2009, 261; 3355564
Abstract (Summary)

United States pig production is centered in Iowa and is a major influence on the economic and ecological condition of that community. A pig production system includes buildings, equipment, production of feed ingredients, feed processing, and nutrient management. Although feed is the largest single input into a pig production system, nearly 30% of the non-solar energy use of a conventional--mechanically ventilated buildings with liquid manure handling--pig production system is associated with constructing and operating the pig facility. Using bedded hoop barns for gestating sows and grow-finish pigs reduces construction resource use and construction costs of pig production systems. The hoop based systems also requires approximately 40% less non-solar energy to operate as the conventional system although hoop barn-based systems may require more feed. The total non-solar energy input associated with one 136 kg pig produced in a conventional farrow-to-finish system in Iowa and fed a typical corn-soybean meal diet that includes synthetic lysine and exogenous phytase is 967.9 MJ. Consuming the non-solar energy results in emissions of 79.8 kg CO2 equivalents. Alternatively producing the same pig in a system using bedded hoop barns for gestating sows and grow-finish pigs requires 939.8 MJ/pig and results in emission of 70.2 kg CO2 equivalents, a reduction of 3 and 12% respectively. Hoop barn-based swine production systems can be managed to use similar or less resources than conventional confinement systems. As we strive to optimally allocate non-solar energy reserves and limited resources, support for examining and improving alternative systems is warranted.

Indexing (document details)
Advisor: Honeyman, Mark S.
Commitee: Harmon, Jay D., Helmers, Mathew J., Kenealy, Michael D., Kliebenstein, James B.
School: Iowa State University
Department: Animal Science
School Location: United States -- Iowa
Source: DAI-B 70/05, Dissertation Abstracts International
Subjects: Animal sciences, Agricultural engineering, Energy
Keywords: Energy, Hoop barns, Nutrient cycling, Swine production
Publication Number: 3355564
ISBN: 978-1-109-14514-4
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