The Methanobrevibacter genus dominates the archaea in the rumen, where on average Mbb. ruminantium accounts for approximately 27% of archaea (Leahy et. al 2010). Photo courtesy of AllAboutFeed.net.
Methanogens like Mbb. ruminantium produce methane through normal digestion of feedstuffs, particularly highly fibrous feedstuffs. The rod-shaped Mbb. ruminantium uses hydrogen and carbon dioxide to produce methane and flourishes with low energy diets. Photo provided by BeefMagazine.com.
Methanogens are found in both the human and ruminant gut and are part of the cause of eructation (belching) in cattle. Photo courtesy of Pixbay.com.
Mbb. ruminantium are a type of methane-producing microbe belonging to a domain of life called archaea. These microbes do not contain a peptidoglycan layer within their cell wall, unlike bacteria. Micrograph courtesy of Zeikus and Bowen; doi: 10.1139/m75-019