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Poster De Conférence Année : 2019

Natural 15N abundances in plasma and urea-N concentration in milk as biomarkers of urinary N excretion in dairy cows: a meta-analysis

Résumé

Knowledge on the flux of nitrogen (N) excreted through urines is essential in animal nutrition since it may provide information on animal N metabolism and the extent of environmental N pollution. Both the 15N natural enrichment of animal proteins over the diet (Δ15Nanimal-diet) and the milk urea N (MUN) concentration have been previously linked to N partitioning. The objective of this meta-analysis was to test the effect of combination of Δ15Nanimal-diet in plasma and MUN for predicting the urinary N excretion (UNE) in dairy cows. Individual data on Δ15Nanimal-diet in plasma, MUN, and UNE of 177 cow/period observations were evaluated by meta-analysis. Data were analyzed by mixed-model regression analysis. When model was fitted with either Δ15Nanimal-diet or MUN, both biomarkers were capable to independently predict UNE. However, when Δ15Nanimal-diet and MUN were combined in one model, both biomarkers remained significant and the error of the model decreased. In conclusion, both Δ15Nanimal-diet and MUN can predict UNE and their combination can strengthen the prediction capacity of the model.
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Format : Poster

Dates et versions

hal-02306171 , version 1 (04-10-2019)

Identifiants

  • HAL Id : hal-02306171 , version 1
  • PRODINRA : 484964

Citer

Sayyed Mahmoud Nasrollahi, Pierre Noziere, Richard J. Dewhurst, Céline Chantelauze, Long Cheng, et al.. Natural 15N abundances in plasma and urea-N concentration in milk as biomarkers of urinary N excretion in dairy cows: a meta-analysis. 6. International Symposium on Energy and Protein Metabolism and Nutrition (ISEP), Sep 2019, BELO HORIZONTE, Brazil. 2019. ⟨hal-02306171⟩
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