: the large first compartment of the stomach of a ruminant in which cellulose is broken down by the action of symbiotic microorganisms compare abomasum, omasum, reticulum
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The Newcastle researchers put cloves, cinnamon and cumin, in addition to the turmeric and coriander, into a solution that includes cow rumen, the bacteria that lives in the cow's digestive tract.—Eric Wolff, Discover Magazine, 5 Oct. 2010 There the cows grazed, chewed cud, and literally ruminated, passing rough forage through a digestive organ, the rumen, that humans lack.—Longreads, 2 Nov. 2022 When food enters the rumen (essentially a large fermentation vat intended to break down the animal’s fibrous meals), gut microbes catalyze a range of chemical transformations.—Elsbeth Sites, Discover Magazine, 16 Dec. 2014 The smaXtec sensor also measures the movement inside of the rumen.—Steven Savage, Forbes, 9 June 2022 The study, published in the scientific journal Frontiers on Friday, looked at samples of rumen from Alpine cows in an abattoir in Austria.—Sara Spary, CNN, 2 July 2021 Anuli had been undergoing treatment since October for episodes of abdominal distension in her rumen, the first compartment in her stomach, according to the zoo.—Gabrielle Chung, PEOPLE.com, 5 Mar. 2021 Anuli had been under treatment since October for episodes of abdominal distension, specifically of her rumen, the first stomach of a ruminant which is where microbial fermentation takes place.—Mckenna Oxenden, baltimoresun.com, 5 Mar. 2021 In particular, the team looked for molecules specific to animals with a rumen, or first stomach, that breaks down dense vegetation into cud.—Theresa MacHemer, Smithsonian Magazine, 7 Feb. 2020
: the large first compartment of the stomach of a cud-chewing mammal (as a cow) in which cellulose is broken down by the action of microorganisms and in which food is stored prior to chewing
: the large first compartment of the stomach of a ruminant from which food is regurgitated for rumination and in which cellulose is broken down by the action of symbiotic microorganisms
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