The rumen, also known as a paunch, is the largest stomach compartment in ruminants. [1] The rumen and the reticulum make up the reticulorumen in ruminant animals.[2] The diverse microbial communities in the rumen allows it to serve as the primary site for microbial fermentation of ingested feed, which is often fiber-rich roughage typically indigestible by mammalian digestive systems.[2][3] The rumen is known for containing unique microbial networks within its multiple sac compartments to break down nutrients into usable energy and fatty acids. [4]