1. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS MANURE NUTRIENT CONTENT ESTIMATION Comparison of different excretion coefficients sets, issues, and possible solutions Agri-environmental Indicators Robert Mayo Alessandro Ferrara Simone Rossi FAO Statistics Division Eurostat, Task Force on Gross Nutrient Balances, Luxembourg, 14-15 November, 2011

2. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Agri-environmental Indicators Organizations involved in nitrogen excretion coefficients estimation European Commission (Eurostat, EU DGs, EEA) FAO IIASA IPCC OECD

3. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Agri-environmental Indicators Step 1: Preparation of a summary of available coefficients from the different organizations Coefficients to convert livestock numbers into manure nitrogen quantity (Kg/head/year) CountryAustraliaAustriaBelgiumBulgariaCanadaChileCyprus Year 2009 2008 2009def. val.2009 PC3221 Dairy Cows95.097.4109.0 122.070.0106.7 PC3222 Other Cows63.078.573.079.040.080.9 PC4000 Buffaloes50.094.8 PC4100 Female breeding buffaloes PC4200 Other buffaloes PP0000 Total of the pig population20.016.0 A121_OECD Pigs < 50 kg PP1000 Piglets < 20 kg live weight3.62.42.9 PP2000 Pigs 20 - 50 kg live weight10.311.37.6 PP3000 Fattening Pigs > 50 kg live weight 10.3 8.5 11.4

4. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Issues highlighted in the summary preparation Livestock type: different animal categories complicate the task of joining together the coefficients to a single sheet and the comparison among them Unit of measurement: –kg of nutrient/head/year –kg/weight/animal –kg/stall place/animal –kg of nutrient / tonnes of manure being used. Livestock management regimes: housing or grazing animals

5. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Agri-environmental Indicators PIGS CATEGORIES OECD generalOECD USAOECD JapanLCA modelGAINSUNFCCCFAOSTAT Tot pigsBreed. pigsPigs <6 monthsAdult femalePigs-slurrySwinePigs Piglets <20 kgHogs < 13 kgPigs >6 monthsAdult malePigs-solid Pigs 20-50 kgHogs 13-30 kg Repl. female Fat.Pigs >50 kgHogs 30-37 kg Repl. male Fat.Pigs 50-80 kgHogs ≥37 kg Meat male Fat.Pigs 80<100 kg Fat.Pigs ≥100 kg Breed.Pigs >50 kg l.w. Boars Sows Covered sows 1 st time covered sows Not covered sows Gilts not yet covered Other pigs Sensitive issue: matching livestock categories between different organizations

6. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Number of animals [heads] (NATIONAL DATA) N-ex coefficients [Kg N/head/yr] (NATIONAL DATA) Number of animals [heads] (FAOSTAT DATABASE) N-ex coefficients [Kg N/head/yr] (LCA – FAO MODEL) N estimated in livestock manure [Kg N/year] Step 2: Comparison of methodologies EUSTAT/OECD and FAO Agri-environmental Indicators

7. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Nitrogen excretion coefficients comparison - Europe

8. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Total manure N content estimation: results and comparison in Europe Agri-environmental Indicators

9. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Next Steps Making comparisons between coefficients for all livestock species: ─ pigs, chickens, goats and sheep Simplified and more effective herd composition breakdown Calculation of manure N content at the global level and comparison with other datasets Need to have a more consistent approach across countries Agri-environmental Indicators

10. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Thank you for your attention robert.mayo@fao.org