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Calculating regional gross nutrient balances

Calculating regional gross nutrient balances. from statistical and administrative data. A Working Program. Anne Miek Kremer & Kees Olsthoorn. Statistics Netherlands. Main Flows in Nitrogen Balances. Livestock manure. Two regions feed rations for ruminants. Silage grass.

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Calculating regional gross nutrient balances

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  1. Calculating regional gross nutrient balances from statistical and administrative data A Working Program Anne Miek Kremer & Kees Olsthoorn Statistics Netherlands

  2. Main Flows in Nitrogen Balances

  3. Livestock manure

  4. Two regions feed rations for ruminants Silage grass Silage maize

  5. Excretion coefficients and feed balances • What livestock consumes must result either in urine/manure or in product (milk, meat etc). • Ruminants: regional feed balances to calculate excretion coefficients • Other livestock: national averaged excretion coefficients

  6. Regional feed balances for ruminants • Feed available for ruminants in the region: • Silage grass and hay: annual survey • Silage maize: annual survey • Concentrates: national sales statistics, index numbers • Meadow grass: unknown, calculated in the feed balance • Dairy cows: consumption of conserved roughage and concentrates is variable • Other ruminants: consumption of conserved roughage and concentrates based on norms • Feed is expressed in VEM (measure for the feeding value) • Feed requirements • Dairy cows: feed requirement is depending on milk production • Other ruminants: standard feed requirements

  7. Regional feed balances for ruminants

  8. Problems with the feed balance for ruminants • Two regions: Very low consumption of meadow grass by dairy cows • NUTS-2 regions: Negative consumption of meadow grass by dairy cows in some regions

  9. Underestimation of feed requirements • Underestimation of feed requirements of dairy cows • Underestimation of feed requirements of other ruminants • Overestimation of VEM-value of meadow grass

  10. Overestimation of silage maize • Maize available for ruminants in year t = production year t-1 • Not taken into account: • Exports of maize • Energy production • Stock changes • 14 ton ds/ha CBS, 12,5 ton ds/ha other research

  11. Overestimation of silage grass and hay • Silage grass and hay available year t = production year t + stock changes • Response silage grass harvest: Grass in pit or field production? • Response grassland area in use: Grassland survey > FSS • Raising results: • 1) production region survey * grassland area region survey (FSS) total grassland area region (FSS) • 2) average production per ha region * total grassland area region (FSS) • Underestimation of grassland production (meadow grass, silage grass, hay)

  12. Other problems effecting feed availability • Consumption of grass by animals not counted in the FSS • FSS 135.000 horses; reality between 300.000-500.000 horses • Consumption of concentrates by other ruminants in pasture season

  13. Allocation of feed between regions • Export and import of feed between regions • Regional differences in feed rations of other ruminants • Regional differences in intake of concentrates by dairy cows

  14. Conclusions • Expert discussion on problems, causes and solutions • Improvement of excretion coefficients for ruminants for two regions • Data on export and import of feed between regions • Option 1: calculating excretion coefficients on the NUTS-2 level for dairy cows. • Option 2: calculating excretion coefficients for two regions for ruminants

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