ADSC 2010: Ruminant Digestive System

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Last updated 6:02 PM on 4/17/26
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11 Terms

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Mouth

  • no top front teeth, dental pad

  • tongue is long with papillae for wrapping around grass

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Esophagus

passageway for feed from mouth to reticulo-rumen or from reticulo rumen to mouth

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Rumen

  • major site of fermentation

  • storage and physical mixing

  • breakdown of cellulose by microbes that releases VFAs absorbed through rumen wall

  • ¾ of abdominal cavity

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Reticulum

Sorts heavy particles (stay) and light particles (go to rumen) → small digesta moved to omasum

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Rumination

Cud Chewing: regurgitation of ingesta from the reticulum

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Eructation

belching; 30-50 L/hour of methane production

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Omasum

Water and some VFA absorption

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Abomasum

  • glandular stomach

  • secretes HCl, pepsin

  • secretes lysozymes, which allows animal to digest microbes

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Remaining digestive tract

very similar to monogastrics

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Babies

born without a functional rumen, milk directly passes to abomasum

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Symbiosis

organisms live together to benefit both (microbes and ruminants)