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Updated: May 6, 2026

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

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Published on: September 7, 2015

Methanogenesis in monogastric animals.

¹Department of Nutrition, Research Centre Foulum, Danish Institute of Animal Science, P.O. Box 39, DK-8830, Tjele, Denmark.

Environmental Monitoring and Assessment

|November 7, 2013

Summary

Methanogenic bacteria in monogastric animals are dominated by Methanobrevibacterium, except in poultry. Methane production in these animals is low, contributing negligibly to global emissions.

Area of Science:

Microbiology
Animal Science
Environmental Science

Background:

Methanogenic bacteria, crucial in anaerobic digestion, are sparsely studied in monogastric animals.
Methanogens identified in various monogastric species include Methanobrevibacter and Methanogenium.

Purpose of the Study:

To investigate the prevalence and methane production of methanogenic bacteria in monogastric animals.
To assess the contribution of monogastric animals to global methane emissions.

Main Methods:

Isolation and identification of methanogenic bacteria from faeces of diverse monogastric species.
Measurement of methane production rates and comparison with stoichiometric estimates.
Analysis of microbial activity and hydrogen metabolism in the hindgut.

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Main Results:

Methanobrevibacter is the predominant methanogen in most monogastric animals, while Methanogenium is found in poultry.
Methane production is significantly higher in the distal colon than the caecum in pigs.
Monogastric animals, especially large herbivores, produce substantial methane, but their overall contribution to global emissions is negligible (approx. 5%).

Conclusions:

Monogastric animals harbor diverse methanogenic communities, with Methanobrevibacter being dominant.
Hydrogen metabolism in the hindgut involves sinks other than methanogenesis.
The global methane emission from monogastric animals is minimal, despite significant production in some species.