Nitrogen partitioning into faeces, urine and milk according to the feeding strategy of dairy cows

Erwan Cutullic, A. Bannink, Jose Manuel Carli, L. A. Crompton, M. Doreau, N. Edouard, P. Faverdin, S. Juranz, A. Klop, J. A. N. Mills, J. M. Moorby, P. Noziere, C. K. Reynolds, A. M. van Vuuren, J.-L. Peyraud

Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddTrafodion Cynhadledd (Nid-Cyfnodolyn fathau)

Crynodeb

Increasing nitrogen (N) efficiency thereby reducing N losses towards air or water and increasing N excretion in milk is a major challenge for European dairy production. Since N losses in faeces and in urine do not have the same fate at the farm level, a precise prediction of N partitioning into milk, faeces and urine at the cow level is required for plausible modelling of farm emissions and management recommendations. In that context, a database gathering more than 1700 complete individual N balances (N intake, in milk, faeces and urine) of lactating dairy cows, of which at least two thirds have a known diet composition, was constructed within the REDNEX European project (FP7, KBB-2007-1). Data originate from trials conducted over the last 40 years in France, United Kingdom and the Netherlands. A wide range of feeding practices is covered with grass hay, grass silage, fresh grass and maize silage based diets, supplemented with 0 to 70% concentrate, and ranging from 120 to 220 g CP/kg DM (5th and 95th percentiles). A wide variation is also observed in performance, with milk yields varying from 12 to 39 kg/day, BW from 480 to 720 kg, and DM intakes from 12 to 24 kg/day. N outputs vary from 80 to 300 g/day in urine, 100 to 230 g/day in faeces and 65 to 190 g/day in milk. The urinary part of N excretion, which varies from 35 to 70%, is strongly reduced with a decrease in CP content of the diet as expected. It is also reduced with an increase in N use efficiency for milk production, defined as the ratio of N in milk to N intake, which varies from 16 to 37%. Further meta-analysis on this large database will precisely characterise N partitioning according to the diet and cow characteristics.
Iaith wreiddiolSaesneg
TeitlProceedings of the 64th Annual Meeting of the European Federation of Animal Science
CyhoeddwrWageningen Academic Publishers
Tudalennau558
ISBN (Argraffiad)978-90-8686-228-3
StatwsCyhoeddwyd - Awst 2013
Digwyddiad64th Annual Meeting of the European Federation of Animal Science - Nantes, Ffrainc
Hyd: 26 Awst 201330 Awst 2013

Cynhadledd

Cynhadledd64th Annual Meeting of the European Federation of Animal Science
Gwlad/TiriogaethFfrainc
DinasNantes
Cyfnod26 Awst 201330 Awst 2013

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