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Poster De Conférence Année : 2019

Nitrogen metabolism in rumen bacteria can be characterised by their N isotopic signature

Résumé

The N use efficiency (NUE) of ruminants is negatively correlated to the natural 15N enrichment of ruminants’ tissues over their diets (Δ15Nanimal-diet). The metabolism of rumen bacteria, which strongly discriminates against 15N utilisation, may contribute to this link but little is known about the role of individual bacteria. In this study, we characterised the Δ15N of three metabolically different rumen bacteria, a cellulolytic ammonia-consuming, a hyperammonia producing and a proteolytic organism, grown in pure culture with different N sources and levels. The N isotopic signatures significantly changed across the 3 rumen bacteria. Although we failed to observe a higher Δ15Nbacteria-substrate when proteolysis and ammonia production was favoured, our results confirm a strong 15N depletion with the ammonia-consuming bacterium. This may suggest that 15N depleted ammonia-consuming bacteria improves the NUE in the rumen.
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Format : Poster

Dates et versions

hal-02306168 , version 1 (04-10-2019)

Identifiants

  • HAL Id : hal-02306168 , version 1
  • PRODINRA : 484970

Citer

Gonzalo Cantalapiedra-Hijar, Gonzalo Martinez Fernandez, Evelyne Forano, Céline Chantelauze, Chris Mcsweeney, et al.. Nitrogen metabolism in rumen bacteria can be characterised by their N isotopic signature. 6. International Symposium on Energy and Protein Metabolism and Nutrition (ISEP), Sep 2019, BELO HORIZONTE, Brazil. , 2019. ⟨hal-02306168⟩
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