Basic Digestive Systems

Basic Digestive Systems - Ba sic Dige stive Syste ms B a...

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10/2/13 Basic Digestive Systems animalscience2.ucdavis.edu/ans1/handouts/digestive_systems.html 1/5 Basic Digestive Systems A. Introduction This material is intended as supplemental to the lectures on individual species, to cover the major distinctions between cattle, pigs, and horses. Material here will cover basic anatomy and physiology, as well as basic information on feedstuffs and nutrition. An interesting website, with more detail on animal digestive systems than you may need at this point, can be found in the on-line text book on Pathophysiology of the Digestive System by R. A. Bowen at Colorado State University. B. Definitions Digestion : process of converting ingested food into material suitable for assimilation for synthesis of tissues or liberation of energy Absorption : to take material into the body through the lymphatic system or blood vessels Metabolism : process used by living organisms & cells to make use of nutrients after absorption. Tissue change, the sum of the chemical changes whereby the function of nutrition is effected. This includes Anabolism - formation and repair of tissues, e.g. make and store fat Catabolism - breakdown of tissues into simpler chemicals e.g., burning fat Oxidation - combination with oxygen, literally "burning" (or liberating) energy Ruminants : Animals with 1 stomach which has several parts; examples are sheep, cattle, goats Nonruminants : Animals with a simple, 1 compartment stomach; examples are pigs, horses, dogs, humans Table Of Digestive System Capacities C. The Digestive Process - Ruminants Mouth and Esophagus chewing - grinding large feed particles to smaller ones for more efficient digestion; with saliva, which contains enzymes to aid in the breakdown of carbohydrates Ruminants do NOT chew food thoroughly, but swallow quickly for later chewing; the tongue plays an important role in directing food to the esophagus The Ruminant Stomach The Rumen The Reticulum The Omasum The Abomasum
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10/2/13 Basic Digestive Systems animalscience2.ucdavis.edu/ans1/handouts/digestive_systems.html 2/5 Solids remain in the rumen for bacterial fermentation, so that when the animal is "full", they lie down and ruminate - contents of the rumen are forced back up through the esophagus for re-chewing. Animals will ruminate 6 to 8 times a day spending 5 to 7 hours in this activity each day. (How might human society be different if we were ruminants?) Rumen and reticulum are not separated but have different functions. The reticulum moves food into the rumen, into the omasum or back up the esophagus.
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Basic Digestive Systems - Ba sic Dige stive Syste ms B a...

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