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Bias

Bias

Bias refers to any tendency that prevents a question from being considered unprejudiced. In research, bias occurs when one outcome or answer is selected or encouraged over others in sampling or testing. Bias can occur during any research phase, including study design, data collection, analysis, and publication.
In statistics, a sampling bias is created when a sample is collected from a population, and some members of the population are not as likely to be chosen as others (remember, each member...

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Related Experiment Video

Updated: Sep 24, 2025

Isolation and Analysis of Microbial Communities in Soil, Rhizosphere, and Roots in Perennial Grass Experiments

Isolation and Analysis of Microbial Communities in Soil, Rhizosphere, and Roots in Perennial Grass Experiments

Published on: July 24, 2018

Rumen sampling methods bias bacterial communities observed.

Jill V Hagey¹, Maia Laabs¹, Elizabeth A Maga¹

¹Department of Animal Science, University of California Davis, Davis, California, United States of America.

|May 5, 2022

Summary

This summary is machine-generated.

Rumen sampling methods like stomach tubing and cannulation yield different microbial community profiles. Solid rumen fractions better represent bacterial communities than liquid fractions, crucial for cattle feed efficiency research.

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Last Updated: Sep 24, 2025

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Published on: July 24, 2018

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Published on: October 15, 2019

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Published on: December 10, 2014

Area of Science:

Rumen microbiology
Animal science
Metagenomics

Background:

The rumen microbiome is key to cattle feed efficiency and environmental impact.
16S rRNA gene sequencing is vital for studying rumen microbial communities.
Oral stomach tubing offers a cost-effective alternative to rumen cannulation for sample collection.

Purpose of the Study:

To evaluate how sampling method (stomach tube vs. cannula) and rumen fraction (liquid vs. solid) influence observed bacterial and archaeal communities.
To compare rumen microbial communities with fecal samples.

Main Methods:

Collected rumen samples via oral stomach tubing and rumen cannulation.
Separated rumen samples into liquid and solid fractions, with liquid further processed (strained vs. unstrained).
Analyzed microbial community composition using 16S rRNA gene sequencing.

Main Results:

Archaeal communities showed similar abundance at the family level across sampling methods.
Bacterial order WCHB1-41 and family Prevotellaceae were enriched in liquid samples compared to grab samples.
Liquid samples had lower Lachnospiraceae abundance; solid samples more closely resembled grab samples, highlighting the importance of particulate matter.

Conclusions:

Rumen sampling method and fraction type significantly bias microbial community analysis.
Solid rumen fractions are more representative of the overall rumen bacterial community than liquid fractions.
Stomach tube samples are variable and primarily reflect the liquid rumen phase, while fecal samples do not accurately represent rumen microbial composition.