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The assessment of the intensive poultry rearing farms within the context of the IPPC Directive (B)


Journal: Proenvironment Promediu
ISSN 1844-6698

Volume: 1;
Issue: 2;
Start page: 42;
Date: 2008;
Original page

Keywords: intensive farms of poultry rearing | assessment of life cycle | mathematical modelling

Poultry production in intensive farms has been steadily increasing since the 1970s. This has occurredthrough a number of factors including increased feed supply through greater use of nitrogen (N) fertilizer andincreased use of supplementary forage feeds. Potentially, the integration of low-protein forage (e.g. maize), toreduce dietary-N concentration, or management practices (e.g. deep layer, cage tier), to reduce excreta to waste,water and soil, can mitigate environmental N emissions and increase efficiency. However, effects of thesemitigation practices on resource use efficiency and environmental emissions, such as greenhouse gas emissionsand N leaching, are becoming more and more substantial, as the production on wider basis increased. This is oneof the reasons for including the large scale poultry farms on the list of the economical activities with significantimpact on environment, being subjected to more and stricter regulations. The direct and indirect environmentalimpacts of poultry farming are currently being investigated by using simulation modelling. The model simulationusing a life cycle assessment approach indicates that N fertilizer increases production and economic efficiencybut decreases environmental efficiency through predicted increases in N leaching and greenhouse gas emissions.In contrast, using forage increases the use of land and production efficiency, with a decrease in N leaching andno increase in greenhouse gas emissions (per capita). A comparison of an average poultry farm applying the BestAvailable Technologies versus an older technology is provided, together with considerations regarding themitigation of impacts on various scales.
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