Reference : Nitrogen excretions in dairy cows on a rotational grazing system: effects of fertilizati...
Scientific congresses and symposiums : Paper published in a book
Life sciences : Animal production & animal husbandry
http://hdl.handle.net/2268/91610
Nitrogen excretions in dairy cows on a rotational grazing system: effects of fertilization type, days in the paddock and time period.
English
Dufrasne, Isabelle mailto [Université de Liège - ULg > Département de productions animales > Nutrition des animaux domestiques >]
Robaye, Vincent mailto [Université de Liège - ULg > Département de productions animales > Nutrition des animaux domestiques >]
Istasse, Louis 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 >]
Sep-2010
Grassland in a changing world
Schnyder, Hans
Isselstein, J.
Taube, F.
Auerwald, K.
Wachendorf, M.
Hermann, A.
Gierus, M.
Wrage, N.
Hopkins, A.
1034-1036
Yes
International
9783869440217
23th General Meeting of the European Grassland Federation
Augusth 29th September 2nd 2010
Kiel University
Kiel
Germany
[en] Nitrogen ; dairy cows ; grazing ; urine
[en] The present study aims to quantify nitrogen (N) excretions in dairy cows on a rotational grazing system with different types of fertilization (mineral N, slurry and compost) after 3 or 5 days in the paddock and during two different periods in June and September. Individual samples of faeces and urine were collected to assess N excretions from cows in the paddocks. The urea content in milk from the tank or from the individual cows was also measured. N intake was higher on day 3 compared to day 5 (465 vs 425 g d-1, P<0.001) and in September as compared to June (488 vs 425 g d-1, P<0.001) but was not influenced by the fertilization type. The amount of excreted urinary N was significantly higher in the mineral N group than in the two other groups (272 vs 226 g d-1; P<0.001). The N excretion in faeces and urines decreased with days (92 vs 84 g d-1, P<0.01; 256 vs 228 g d-1, P<0.001 respectively for days 3 and 5). Urinary N excretion was lower in June than in September (181 vs 302 g d-1, P<0.001) while the N excretion in the faeces was higher (96 vs 80 g d-1, P<0.01).
http://hdl.handle.net/2268/91610

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