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Incidences phytotechniques et zootechniques d'une réduction ou d'une suppression de la fertilisation azotée sur des prairies pâturées par des vaches laitières

Authors
Publication Date
Keywords
  • Dairy Cows
  • Vaches Laitières
  • Nitrogen Fertilization
  • Fertilisation Azotée
  • Grazing
  • Pâturage
  • Milk Yield
  • Production
  • Nitrogen Balance
  • Bilan Azoté
  • Life Sciences :: Agriculture & Agronomy [F01]
  • Sciences Du Vivant :: Agriculture & Agronomie [F01]
Disciplines
  • Agricultural Science
  • Biology

Abstract

05¥Z1403.Dieguez Q Anim. Res. 50 (2001) 299–314 299 © INRA, EDP Sciences, 2001 * Correspondance et tirés-à-part Tél. : (32) 4 366 23 73 ; fax : (32) 4 366 23 70 ; e-mail : [email protected] Article original Incidences phytotechniques et zootechniques d’une réduction ou d’une suppression de la fertilisation azotée sur des prairies pâturées par des vaches laitières Francisco DIEGUEZa*, Jean-Luc HORNICKa, Vanessa DE BEHRa, Louis ISTASSEa, Isabelle DUFRASNEb a Service de Nutrition, Bât. B43, Faculté de Médecine Vétérinaire, Université de Liège, 4000 Liège, Belgique b Station Expérimentale, Bât. B39, Faculté de Médecine Vétérinaire, Université de Liège, 4000 Liège, Belgique (Reçu le 10 août 2000 ; accepté le 11 juin 2001) Abstract — Phytotechnical and zootechnical effects of a nitrogen fertilizer reduction or suppression on pasture grazed by dairy cows. Three levels of intensification were compared for a permanent pasture grazed over 6 consecutive years in a rotational grazing system. The three levels of intensification were as follow: a high nitrogen fertilizer input system with 136 kg N.ha–1 and with 3.35 cows.ha–1 – H-N group –, a system with a moderate fertilizer input in which nitrogen fertiliza- tion was reduced by 33% but with the same stocking rate – M-N group – with 91 kg N.ha–1 along with 3.35 cows.ha–1 and a system with no fertilization associated with a reduced stocking rate – 0-N group – with 2.51 cows.ha–1. There were no effects of the treatments on grass character- istics – e.g. post grazing height, percentage of refusals, total nitrogen content, fiber content. The absence of nitrogen fertilization reduced the pre-grazing height and DM yield of the pasture. The clover content was reduced in the first and sixth years in nitrogen fertilized groups. The individual milk yield was not affected by the treatments (15.4 kg.d–1) but the milk yield per hectare was largely affected by the stocking rate. The protein content and cell count were unaffected by the treatments

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