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Application of Flow Vermimetry for Quantification and Analysis of the Caenorhabditis elegans Gut Microbiome
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Increased Yearling Weight Gain Is Associated with a Distinct Faecal Microbial Profile.

Brianna N Maslen1, Christian Duff2, Samuel A Clark3

  • 1Gulbali Institute, Charles Sturt University, Boorooma Street, Wagga Wagga, NSW 2678, Australia.

Animals : an Open Access Journal From MDPI
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Summary

Gut microbiota significantly impacts livestock growth performance. This study found distinct fecal microbial profiles in Angus steers with high versus low average daily gain (ADG) at the yearling stage, indicating a link between gut bacteria and growth.

Keywords:
16S rRNAAngus steersaverage daily gainfaecalmicrobial profilesweaning weightyearling weight

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Area of Science:

  • Animal Science
  • Microbiology
  • Genomics

Background:

  • Gut microbial communities play a crucial role in livestock physiological processes and production traits.
  • Animal production traits, particularly growth performance, are vital for the profitability of livestock enterprises.
  • Previous research suggests a correlation between gut microbiota composition and growth performance in livestock.

Purpose of the Study:

  • To characterize and compare the fecal microbial profiles of Angus steers exhibiting high and low average daily gain (ADG).
  • To investigate these microbial differences at both the weaning and yearling stages of development.
  • To determine if gut microbiota composition is associated with growth performance differences in beef cattle.

Main Methods:

  • Rectal fecal samples were collected from Angus steers categorized by high and low ADG.
  • 16S rRNA gene sequencing was employed to profile the microbial communities.
  • Analyses included comparisons of relative abundances, LEfSe, alpha diversity (species richness), and beta diversity (phylogenetic similarity).

Main Results:

  • Few significant microbial differences were observed between high and low ADG groups at the weaning stage.
  • At the yearling stage, significant differences in microbial profiles emerged between high and low ADG groups.
  • Eight phyla and six genera showed significantly different relative abundances; species richness decreased in the high ADG group (p=0.001), and beta diversity clearly separated the groups (p=0.005).

Conclusions:

  • Gut microbial profiles differ significantly between Angus steers with high and low average daily gain, particularly at the yearling stage.
  • Reduced species richness and altered phylogenetic similarity in the gut microbiota are associated with higher growth performance (ADG).
  • These findings highlight the potential of targeting gut microbiota for enhancing growth performance in beef cattle.