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Related Experiment Video

Updated: Jul 10, 2026

Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure
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Quantifying ammonia emissions from a cattle feedlot using a dispersion model.

S M McGinn1, T K Flesch, B P Crenna

  • 1Agriculture and Agri-Food Canada, 5403-1 Ave South, Lethbridge, Alberta, Canada T1J 4B1. mcginns@agr.gc.ca

Journal of Environmental Quality
|October 18, 2007
PubMed
Summary

Beef cattle feedlots emit significant ammonia (NH3), a pollutant impacting air quality and ecosystems. This study quantified NH3 emissions from a Canadian feedlot, providing crucial data for environmental management strategies.

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Last Updated: Jul 10, 2026

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Published on: September 7, 2015

Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Agricultural Science

Background:

  • Livestock manure is a major source of ammonia (NH3) emissions.
  • Atmospheric NH3 contributes to fine aerosol formation, impacting air quality and human health.
  • NH3 deposition to land and water causes environmental degradation.

Purpose of the Study:

  • To quantify ammonia (NH3) emissions from a beef cattle feedlot.
  • To investigate factors influencing NH3 emission rates.
  • To provide data for assessing farm management impacts on NH3 reduction.

Main Methods:

  • Utilized a backward Lagrangian stochastic (bLS) inverse-dispersion technique.
  • Measured NH3 concentration using an open-path laser.
  • Measured wind speed using a sonic anemometer.

Main Results:

  • Average NH3 emission rate of 3146 kg NH3 d(-1) from the feedlot.
  • Emissions correlated with sensible heat flux (r2 = 0.84) and wind speed (r2 = 0.56).
  • Rain was observed to suppress NH3 emissions.

Conclusions:

  • Quantifying NH3 emissions from feedlots is vital for environmental impact assessment.
  • Understanding emission drivers aids in developing effective farm management practices.
  • This study provides essential data for mitigating NH3-related environmental issues.