towards climate-smart milk production
Greenhouse gas emissions from Swedish milk production.
Acta Universitatis agriculturae Sueciae, 1652-6880
Greenhouse gas (GHG) emissions from food production represent 19-29% of global anthropogenic GHG and the dairy sector alone is estimated to contribute around 3%. This thesis assessed GHG estimates for milk production (i.e. milk carbon footprint (CF)) in a life cycle perspective. Uncertainties in milk CF were examined for two contrasting milk production systems (an intensive system in Sweden (SE) and a more extensive system in New Zealand (NZ)) and variations in milk CF estimates between Swedish dairy farms were determined. GHG emissions from feed production and enteric fermentation, representing around 85% of milk CF, were estimated on herd level for different feeding strategies related to regional conditions for feed cultivation. The methodology used was Life Cycle Assessment with the system boundary 'cradle to farm gate'.
National average milk CF for SE and NZ was estimated to be 1.16 and 1.00 kg carbon dioxide equivalents (CO₂e)/kg energy corrected milk (ECM) respectively, with uncertainty of approximately ±30% due to uncertainties in emissions factors predicting enteric CH₄ and soil N₂O emissions, which were among the most influential parameters for milk CF estimates. The most influential variable was feed intake. Milk CF was found to vary by approximately ±17% between Swedish dairy farms due to differences in management practices, indicating potential for reducing GHG emissions on farm level. GHG emissions from different feeding strategies varied between 0.42 and 0.53 kg CO₂e/kg ECM for feed production, and between 0.50 and 0.52 kg CO₂e/kg ECM for corresponding enteric CH₄. Thus differences in feeding strategy affected GHG emissions from feed production more than enteric CH₄ production. Roughage production contributed >50% of the emissions and grass silage CF varied markedly (by 17%) between regions and influenced the overall emissions. It was also influenced by feed losses from silage storage and feeding. Grass silage nutrient quality also influenced emissions from feed production and enteric CH₄ production. Replacement animals contributed approximately 20% of these GHG.
The large uncertainties in milk CF indicate that values should not be compared unless estimated with harmonised methods and that caution is needed when they are used in mitigation studies. Efficient use of all resources is an important general mitigation measure. Measures with varying effects need to be evaluated at farm level.
|Title:||Greenhouse gas emissions from Swedish milk production|
|Subtitle:||towards climate-smart milk production|
|Series/Journal:||Acta Universitatis agriculturae Sueciae (1652-6880)|
|Year of publishing :||2 April 2014|
|Number of Pages:||102|
|Place of Publication:||Alnarp|
|Publisher:||Dept. of Biosystems and Technology, Swedish University of Agricultural Sciences|
|ISBN for printed version:||978-91-576-8004-4|
|ISBN for electronic version:||978-91-576-8005-1|
|Publication Type:||Doctoral thesis|
|Full Text Status:||Public|
|Agris subject categories.:||L Animal production > L01 Animal husbandry|
T Pollution > T01 Pollution
|Subjects:||(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research|
(A) Swedish standard research categories 2011 > 1 Natural sciences > 107 Other Natural Sciences > Other Natural Sciences
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
|Agrovoc terms:||milk, milk production, carbon dioxide, environmental impact, greenhouse gases, feed production, land use, life cycle analysis, farms, statistical uncertainty, sweden|
|Keywords:||carbon footprint, farm level, feed production, greenhouse gases, life cycle assessment, land use, milk production, mitigation, NorFor, uncertainties, variations|
|Faculty:||LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap|
|Department:||(LTJ, LTV) > Department of Biosystems and Technology (from 130101)|
(VH) > Department of Biosystems and Technology (from 130101)
|Deposited By:||doktorand Maria Henriksson|
|Deposited On:||04 Apr 2014 06:39|
|Metadata Last Modified:||02 Dec 2014 11:05|
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