Abstract
To assess greenhouse gas (GHG) emission intensity and its variation in Norwegian pig production, we conducted an analysis of 15 farrow-to-finish pig farms to calculate farm-scale emissions of GHGs, expressed as carbon dioxide equivalents (CO2eq) per kg carcass weight (CW) sold. A model, HolosNor, was developed to estimate net GHG emissions, including soil C changes, from pig farms. Based on data from 2008 the estimated GHG intensity was 2.65 kg CO2eq kg−1 CW (range: 1.24–4.03). The production of the feed consumed by the pigs contributed most to total GHG emissions; accounting for 2.14 kg CO2eq kg−1 CW, or more than 80% of the total emissions. Our study estimated a large variation in GHG intensity among pig farms in Norway which indicates opportunity for incorporating mitigation practices. A valuable contribution of the current work is the framework of a farm-scale tool for assessing farm-specific mitigation options.
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