Poster De Conférence Année : 2022

Nitrogen flows in dairy cows fed various proportions of low-N fresh grass and maize silage

Résumé

Dairy farms must reduce their environmental impacts and nitrogen (N) losses to ensure sustainable and efficient production. Combining fresh grass and conserved forages is common in dairy cow diets. However, the consequences of these associations, in different proportions, on N-use efficiency and flows at the animal level are poorly understood. This study aimed at quantifying the effects of four maize silage proportions in a fresh grass-based diet (0:100, 17:83, 34:66, 51:49 of maize silage:fresh grass ratio, dry matter (DM) basis), without any concentrate supply, on cow N excretion and N-use efficiency. The experiment was conducted with 7 lactating Holstein cows in a Latin square design. Intake, milk, urine and faeces amounts and their N concentration were measured individually. The crude protein (CP) concentrations of the 4 diets ranged between 107 and 86 g kg-1 DM, due to the very low grass CP concentration. DM intake and milk production decreased with increasing maize proportion in the diet, as well as faecal and urinary N excretions. Including 50% of maize silage in a low-N grass diet improved N-use efficiency. These results should help to improve predictive equations of N losses for feeding strategies combining fresh grass and maize silage.

Fichier principal
Vignette du fichier
105_Ferreira.pdf (459.88 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

hal-03755887 , version 1 (08-11-2022)

Licence

Identifiants

  • HAL Id : hal-03755887 , version 1

Citer

Manon Ferreira, Remy Delagarde, Nadège Edouard. Nitrogen flows in dairy cows fed various proportions of low-N fresh grass and maize silage. 29. General meeting of the European Grassland Federation (EGF), Jun 2022, Caen, France. Wageningen academic publishers, Grassland Science in Europe, 27, pp.566-568, Grassland at the heart of circular and sustainable food systems. Proceedings of the 29th General Meeting of the European Grassland Federation. ⟨hal-03755887⟩

Collections

102 Consultations
145 Téléchargements

Partager

  • More