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The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.
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Rumen Microbial Predictors for Short-Chain Fatty Acid Levels and the Grass-Fed Regimen in Angus Cattle.

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Grass-fed cattle have a more diverse and stable rumen microbiome than grain-fed cattle. Specific microbial signatures, like the ratio of Sutterella to Desulfovibrio, can predict feeding regimens and optimize cattle growth.

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Area of Science:

  • Rumen microbiome research
  • Animal science
  • Microbial ecology

Background:

  • Grass-fed beef offers health benefits, but the specific rumen microbiome characteristics are not well understood.
  • The rumen microbiome plays a crucial role in cattle digestion and overall health.

Purpose of the Study:

  • To investigate and compare the rumen microbiome profiles of beef steers under grass-fed versus grain-fed regimens.
  • To identify key microbial differences and their potential implications for cattle production.

Main Methods:

  • Comparative analysis of rumen microbial communities using sequencing techniques.
  • Bioinformatic analyses including ANCOM-BC for differential abundance and Random Forest for classification.
  • Correlation analysis between microbial signatures and short-chain fatty acids (SCFAs).

Main Results:

  • Grass-fed cattle exhibited significantly greater species diversity and microbial alpha diversity in their rumen.
  • Rumen microbial networks in grass-fed cattle were more modular, indicating higher stability.
  • Specific genera, including unclassified genera from Planctomycetes, SR1, and Sutterella, were enriched in grass-fed steers.
  • A microbial predictor (SR1/Bacteroidales) and a Sutterella/Desulfovibrio ratio were identified as potential biomarkers.

Conclusions:

  • The feeding regimen significantly shapes the rumen microbiome composition and stability in beef steers.
  • Identified microbial biomarkers can distinguish feeding types and may be used to optimize cattle growth and feed efficiency.
  • Findings provide insights for developing targeted strategies to improve grass- or pasture-fed cattle production.