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Updated: Aug 24, 2026

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals
Published on: September 7, 2015
The measurement of methane losses from grazing animals
1Institute of Grassland and Environmental Research, North Wyke Research Station, Okehampton, Devon, EX20 2SB, UK.
Abstract:
A detailed description is given of the construction, operation and calibration of a system designed to measure methane emissions from sheep grazing in the field under as near natural conditions as possible. Results from four preliminary studies show that emission of methane averaged 14 g day(-1) per animal, equivalent to 5.1 kg year(-1) per animal. These rates, although lower than some estimates, confirm that methane emission from sheep forms a significant proportion of the total methane emissions currently attributed to UK agriculture.
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