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Calculating regional gross nutrient balances

This working program by Anne Miek Kremer and Kees Olsthoorn analyzes regional gross nutrient balances through statistical and administrative data, focusing on nitrogen flows in livestock. It highlights feed rations for ruminants, the importance of silage (grass and maize), and the calculation of excretion coefficients based on regional feed balances. The study identifies key issues concerning feed availability, consumption discrepancies among different livestock, and provides potential solutions for improving nutrient management in agricultural practices.

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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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