4.6 Article

Identification of Microbial Genetic Capacities and Potential Mechanisms Within the Rumen Microbiome Explaining Differences in Beef Cattle Feed Efficiency

Journal

FRONTIERS IN MICROBIOLOGY
Volume 11, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2020.01229

Keywords

rumen microbiome; predicted microbial mechanisms; feed conversion efficiency; high concentrate diet; metagenomic sequencing

Categories

Funding

  1. Biotechnology and Biological Sciences Research Council [BBSRC BB/N01720X/1, BB/N016742/1, BB/S006567/1, BB/S006680/1]
  2. Scottish Government
  3. Scottish Government as part of the 2011-2016 commission, Agriculture and Horticulture Development Board (AHDB) Beef Lamb
  4. Department for Environment Food & Rural Affairs (Defra)
  5. Quality Meat Scotland (QMS)
  6. BBSRC [BB/N01720X/1, BB/S006567/1, BB/S006680/1, BBS/E/D/30002276, BB/R015023/1, BB/N016742/1] Funding Source: UKRI

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In this study,Bos Tauruscattle offered one high concentrate diet (92% concentrate-8% straw) during two independent trials allowed us to classify 72 animals comprising of two cattle breeds as Low or High feed efficiency groups. Digesta samples were taken from individual beef cattle at the abattoir. After metagenomic sequencing, the rumen microbiome composition and genes were determined. Applying a targeted approach based on current biological evidence, 27 genes associated with host-microbiome interaction activities were selected. Partial least square analysis enabled the identification of the most significant genes and genera of feed efficiency (VIP > 0.8) across years of the trial and breeds when comparing all potential genes or genera together. As a result, limited number of genes explained about 40% of the variability in both feed efficiency indicators. Combining information from rumen metagenome-assembled genomes and partial least square analysis results, microbial genera carrying these genes were determined and indicated that a limited number of important genera impacting on feed efficiency. In addition, potential mechanisms explaining significant difference between Low and High feed efficiency animals were analyzed considering, based on the literature, their gastrointestinal location of action. High feed efficiency animals were associated with microbial species including severalEubacteriumhaving the genetic capacity to form biofilm or releasing metabolites like butyrate or propionate known to provide a greater contribution to cattle energy requirements compared to acetate. Populations associated with fucose sensing or hemolysin production, both mechanisms specifically described in the lower gut by activating the immune system to compete with pathogenic colonizers, were also identified to affect feed efficiency using rumen microbiome information. Microbial mechanisms associated with low feed efficiency animals involved potential pathogens within Proteobacteria and Spirochaetales, releasing less energetic substrates (e.g., acetate) or producing sialic acid to avoid the host immune system. Therefore, this study focusing on genes known to be involved in host-microbiome interaction improved the identification of rumen microbial genetic capacities and potential mechanisms significantly impacting on feed efficiency in beef cattle fed high concentrate diet.

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