Abstract

Livestock manure management systems can be significant sources of nitrous oxide (N2O) methane (CH4) and ammonia (NH3) emissions. Many studies have been conducted to improve our understanding of the emission processes and to identify influential variables in order to develop mitigation techniques adapted to each manure management step (animal house, outdoor storage, and manure spreading to land). The international project DATAMAN (http://www.dataman.co.nz) aims to develop a global database on greenhouse gases (N2O, CH4) and NH3 emissions from the manure management chain to refine emission factors (EF) for national greenhouse gas (GHG) and NH3 inventories. This paper deals with the housing and outdoor storage components of this database. Relevant information for different animal categories, manure types, livestock buildings, outdoor storage and climatic conditions were collated from published peer reviewed research, conference papers and existing databases published between 1995 and 2021. The storage database contains 654 NH3 EF from 16 countries, 243 CH4 EF from 13 countries and 421 N2O EF from 17 countries. Across all gases, dairy cattle and swine production in temperate climate zones are the most represented animal and climate categories. In the housing database, 2024 EF were collated (63% for NH3, 19.5% for CH4 and 17.5% for N2O). As for the storage database, the number of EF for the tropical climate zone is under-represented with only 8 values included. The DATAMAN database can be used for the refinement of national inventories and better assessment of the cost-effectiveness of a range of mitigation measures.