Reference : Vers une révision de la norme de production d'azote de la vache laitière : justificat...
Scientific congresses and symposiums : Paper published in a book
Life sciences : Animal production & animal husbandry
http://hdl.handle.net/2268/93743
Vers une révision de la norme de production d'azote de la vache laitière : justification et conséquences sur le taux de liaison
French
Lambert, Richard mailto [Université Catholique de Louvain - UCL > Departement de Biologie appliquée et des Productions agricoles > > >]
De Toffoli, M. [Université de Louvain - UCL > Biologie appliquée et Productions agricoles > > >]
Dufrasne, Isabelle mailto [Université de Liège - ULg > Département de productions animales > Nutrition des animaux domestiques >]
Hornick, Jean-Luc mailto [Université de Liège - ULg > Département de productions animales > Nutrition des animaux domestiques >]
Stilmant, Didier mailto [Université de Liège - ULg > Sciences agronomiques > Zootechnie >]
Seutin, Yves [Centre wallon de Recherches agronomiques (CRA-W) > sections systèmes agricoles > > >]
2010
Acte de l'atelier "Nitrate - Eau"
Marcoen, Jean Marie mailto
Vandenberghe, Christophe mailto
Presses agronomiques
67-71
Yes
Yes
National
9782870161036
Gembloux
Belgique
Atelier "Nitrate - Eau"
2 au 5 juin 2009
Université de Liège
Peyresq
France
[en] Nitrogen ; dairy cows ; excretion ; soil link rate ; Wallonia
[en] Towards a revison of the dairy cow’s standard for nitrogen production: justification and what are consequences for soil link rate of dairy farms. At present, the dairy cow’s standard of nitrogen production in Walloon region is 90 kg per year. This standard is used to calculate the “soil link rate” of farms, a balance between the organic nitrogen to be spread on land and
the quantity legally authorized considering grassland and arable land area. This standard is appreciably lower than that fixed by other member states and was criticized by the European Commission during the negotiations having ended in the second program of sustainable nitrogen management. Further to new studies, it seems that the gaseous loss of nitrogen averages in buildings and during the storage is weaker than the 15% value which was used to justify this 90 kg standard. It also seems that there are big differences of average dairy production and average rate of urea according to the agricultural regions and consequently that regional production standards correspond better to the reality. On basis of these mean values, the dairy cow’s annual productions of nitrogen vary between 81 kg per year in grassy region of Fagne and 99 kg per year in Haute Ardenne and in grassy region from Liege. For the Walloon region in general, the average production is 94 kg per year. The adoption of different values of dairy cow’s nitrogen production by region would lead to an increase of 8% of the soil link rate of dairy farms in Haute Ardenne and of 7% in grassy region from Liege and a decrease of 7% in grassy region of Fagne.
http://hdl.handle.net/2268/93743

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