Rumen bacterial community evaluated by 454 pyrosequencing and terminal restriction fragment length polymorphism analyses in dairy sheep fed marine algae

T. Castro-Carrera, P. G. Toral, P. Frutos, N. R. McEwan, G. Hervas, L. Abecia, E. Pinloche, S. E. Girdwood, A. Belenguer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Developing novel strategies to increase the content of bioactive unsaturated fatty acids (FA) in ruminant-derived products requires a deeper understanding of rumen biohydrogenation and bacteria involved in this process. Although high-throughput pyrosequencing may allow for a great coverage of bacterial diversity, it has hardly been used to investigate the microbiology of ruminal FA metabolism. In this experiment, 454 pyrosequencing and a molecular fingerprinting technique (terminal restriction fragment length polymorphism; T-RFLP) were used concurrently to assess the effect of diet supplementation with marine algae (MA) on the rumen bacterial community of dairy sheep. Eleven lactating ewes were divided in 2 lots and offered a total mixed ration based on alfalfa hay and concentrate (40:60), supplemented with 0 (control) or 8 (MA) g of MA/kg of dry matter. After 54 d on treatments, animals were slaughtered and samples of rumen content and fluid were collected separately for microbial analysis. Pyrosequencing yielded a greater coverage of bacterial diversity than T-RFLP and allowed the identification of low abundant populations. Conversely, both molecular approaches pointed to similar conclusions and showed that relevant changes due to MA addition were observed within the major ruminal phyla, namely Bacteroidetes, Firmicutes, and Proteo bacteria. Decreases in the abundance of unclassified Bacteroidales, Porphyromonadaceae, and Ruminococcaceae and increases in as-yet uncultured species of the family Succinivibrionaceae, might be related to a potential role of these groups in different pathways of rumen FA metabolism. Diet supplementation with MA, however, had no effect on the relative abundance of Butyrivibrio and Pseudo butyrivibrio genera. In addition, results from both 454 pyrosequencing and T-RFLP indicate that the effect of MA was rather consistent in rumen content or fluid samples, despite inherent differences between these fractions in their bacterial composition.

Original languageEnglish
Pages (from-to)1661-1669
Number of pages9
JournalJournal of Dairy Science
Volume97
Issue number3
Early online date17 Jan 2014
DOIs
Publication statusPublished - Mar 2014

Keywords

  • ewe
  • lipid
  • ruminal microbiota
  • 16S rDNA
  • FATTY-ACID-COMPOSITION
  • FISH-OIL SUPPLEMENTS
  • RIBOSOMAL-RNA GENES
  • MICROBIAL COMMUNITIES
  • RUMINAL BIOHYDROGENATION
  • SUNFLOWER OIL
  • LINOLEIC-ACID
  • DIVERSITY
  • DIETS
  • COWS

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