ADSC 2010 Lecture 16Outline of Last Lecture I. Video- RuminantsII. Digestive Systems- MonogastricsA. MonogastricsB. Component Functionsa. Mouthb. Esophagusc. Stomachd. Small Intestine1. Three Sections2. Digestion in SI3. Digestive OrgansOutline of Current Lecture I. Digestive Systems- Monogastrics continuedII. Pig Diagram: EnzymesA. Salivary GlandB. StomachC. DuodenumD. PancreasE. Liver/Gall BladderIII. Large IntestineIV. Ruminant Digestive SystemA. Segments of Ruminant Digestive System1. MouthCurrent Lecture: I. Digestive Systems- Monogastrics continuedA. Small Intestine- Pancreas also secretes insulin and glucagon to control blood glucose levelsII. Pig Diagram: Enzymes- Absorption: feed digested to “amino acids, glucose, and fatty acids” it is absorbed into bloodstream- Metabolites travel to liver and are further metabolized or detoxified if harmfulIII. Large IntestineA. Cecum: Blind end of the anterior LI- Important in Horses as a site of microbial digestion- Microbes digest cellulose and produce “volatile fatty acids”B. Colon: Major site of water absorptionC. Rectum: Expels material out of body- Pig LI = 12 feet long.IV. Ruminant Digestive System- Ruminant: Four-footed, even-toed, cud chewing animals which have a stomach consisting of four division or chambers1. Rumen2. Reticulum3. Omasum4. AbomasumForegut Fermenter: Cattle, sheep, deer, goats, buffaloA. Segments of Ruminant Digestive System1. MouthPepsin: ProteinaseRenninSmall amounts of lipaseMucinAmylaseCarbsMaltoseLactoseSucroseProteinsAmino peptidaseDipeptidaseDNA/RNANucleotidaseNucleosidase CarbsAmylaseLypaseProteinsTrypsinChymotrypsinCarboxinpeptaseBile- Large amount in a short period of time- Cattle: dental pad- Sheep: Flexible (split) lip = closer grazers- Tongue: long, papillae for wrapping around grass- Saliva: no enzymes, lubricant
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