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Poster De Conférence Année : 2019

Plasma natural 15N abundance may predict both feed conversion efficiency and residual feed intake in beef cattle across different dietary conditions

Résumé

Cheap and rapid methods to predict between-animal variability of feed efficiency (FE) are needed. We evaluated, by using a large dataset on beef cattle (n = 355) fed contrasting diets (grass vs corn based diets), the potential of plasma natural 15N abundance (δ15N) as a biomarker of between-animal variation in FE, measured either as feed conversion efficiency (FCE) or residual feed intake (RFI). Data were analyzed by mixed models, with diet and δ15N as a fixed effect and experimental farm, batch and pen as random effects. A negative and significant correlation was found between FCE and δ15N within each contemporary group, with a lower response (slope) however in grass vs corn diets (δ15N × diet interaction; P = 0.002). Likewise, we found a significant but positive relationship between δ15N and RFI, but without the influence of diet or any tested random effect. Our results indicate that δ15N is a promising biomarker of between-animal variation of feed efficiency (FCE and RFI) in growing beef cattle.
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Format : Poster

Dates et versions

hal-02306170 , version 1 (04-10-2019)

Identifiants

  • HAL Id : hal-02306170 , version 1
  • PRODINRA : 484965

Citer

Pablo Guarnido Lopez, Sayyed Mahmoud Nasrollahi, Céline Chantelauze, Gilles Renand, Clément Fossaert, et al.. Plasma natural 15N abundance may predict both feed conversion efficiency and residual feed intake in beef cattle across different dietary conditions. 6. International Symposium on Energy and Protein Metabolism and Nutrition (ISEP), Sep 2019, BELO HORIZONTE, Brazil. , 2019. ⟨hal-02306170⟩
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