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Related Experiment Video

Updated: Jun 2, 2026

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals
11:02

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

Published on: September 7, 2015

Methane emissions from grazing cattle using point-source dispersion.

S M McGinn1, D Turner, N Tomkins

  • 1Agricultural and Agri-Food Canada, 5403-1 Ave. South, Lethbridge, AB, Canada T1J 4B1. sean.mcginn@agr.gc.ca

Journal of Environmental Quality
|April 15, 2011
PubMed
Summary
This summary is machine-generated.

Accurately measuring enteric methane emissions from grazing cattle is crucial for greenhouse gas reduction. This study introduces a nonintrusive laser-based method to quantify these emissions, offering more reliable daytime measurements.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Atmospheric Science

Background:

  • Accurate quantification of greenhouse gas (GHG) emissions, particularly enteric methane from ruminants, is vital for climate change mitigation strategies.
  • Enteric methane emissions are a significant source of GHGs globally, especially from cattle, but are challenging to measure accurately due to variations in feed intake.
  • Existing measurement techniques can alter animal feed intake, compromising data reliability.

Purpose of the Study:

  • To evaluate a novel, nonintrusive technique for calculating enteric methane emissions from grazing cattle.
  • To assess the feasibility of using a point-source dispersion method with multiple open-path concentrations for GHG measurements.
  • To provide a more reliable method for quantifying methane emissions from a major agricultural source.

Main Methods:

  • A scanner with an open-path laser was employed to measure methane concentrations across five paths above a cattle paddock.
  • Data on methane concentration and wind statistics were integrated into the WindTrax dispersion model.
  • Herd methane emission rates were estimated at 10-minute intervals over a 16-day period.

Main Results:

  • The average herd enteric methane emission rate was calculated at 141 (+/- 147) g animal⁻¹ d⁻¹ for cattle grazing Rhodes grass and Leucaena.
  • A release-recovery experiment demonstrated that the technique accounted for 77% of released methane at a single point.
  • The study found that the technique yields more reliable methane emission data during daytime conditions characterized by unstable atmospheric stratification.

Conclusions:

  • The developed nonintrusive laser-based technique offers a promising approach for accurately estimating enteric methane emissions from grazing livestock.
  • This method addresses limitations of previous techniques by not altering animal feed intake, leading to more reliable data.
  • The findings contribute to improved GHG inventory management and inform mitigation efforts in the agricultural sector, particularly in countries like Australia.