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- Publications & Research
- Publication #119
Nitrogen food-print: N use and N cascade from livestock systems in relation to pork, beef and milk supply to Paris
- Nitrogen food-print: N use and N cascade from livestock systems in relation to pork, beef and milk supply to Paris
- P Chatzimpiros
- Sabine Barles
- Journal Article
Biogeosciences Discussions, Volume 9, Pages 1971--2004
- A bottom-up approach is constructed to determine N losses from livestock farming sys-
tems and to relate these losses to the supply of fresh milk, pig and beef to Paris. First,
the three products are expressed in terms of their nitrogen content; then, their fodder
equivalent is determined by modelling feed formulas for swine, beef and dairy cows
to meet their energy and protein requirements. Fodder deficits in livestock farms are
determined by comparing the nutrient requirements of the livestock with the fodder pro-
duction on the livestock farms. This allowed determining the geography of the livestock
systems according to the imports of fodder to the livestock farms from external crop
farms. Then we assessed the “farm-gate” N budgets in all crop and livestock farms of
the entire livestock systems using data on total N fertilization, atmospheric deposition
and manure management practices to finally derive N losses in relation to fodder cul-
tivation and to manure management. Measured in N, the supply of milk, beef and pig
to Paris sum 1.85 kg N/cap and the corresponding N losses from the farming systems
total 8.9 kg N/cap. N losses per unit of product differ among the three livestock systems
according to where and how the fodder is grown and to what densities the livestock is
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