ADSC 2010 Lecture 15Outline of Last Lecture I. Nutrient Utilization & RequirementsA. Maintenance Requirementsa. NutrientsB. Nutrient Utilization for ProductionII. Digestion MovieA. PrehensionB. MasticationC. Monogastrics & PoultryOutline of Current Lecture I. Video- RuminantsII. Digestive Systems- MonogastricsA. MonogastricsB. Component Functionsa. Mouthb. Esophagusc. Stomachd. Small Intestine1. Three Sections2. Digestion in SI3. Digestive OrgansCurrent LectureI. Video- RuminantsEsophagus Rumen Reticulum Omasum Abomasum (True Stomach) small intesting T-Junction Cecum (appendix) Large Intestine Rectum- Ruminants are nonselective eaters... can get hair balls.II. Digestive Systems- MonogastricsA. Monogastrics: simple stomached animals usually with an acid environmentExamples: Pigs, horses, chickens, humansB. Component Functionsa. Mouth- Chewing: physical breakdown (upper & lower teeth)- Salivation:- Adds moisture- H2O- Lubricates- Mucin- Source of Enzymes- amalyse (breaks down carbs… Starch, not cellulose)- Bicarbonate salts- HCO4 (buffer)b. Esophagus: One Way- Mouth Stomachc. Stomach: storage and digestion of food/muscle contractions cause physical breakdown- HCL: lowers pH of stomach (2.0-3.0), kills most bacteria, activates enzymes- Pepsinogen + HCL pepsin- Enzymes- pepsin: protein digestion- rennin: coagulates milk protein- limited amount of lipase activity (fatty acid & glycerol breakdown)- Stomach mixes feed well and initiates limited digestion. Feed mixture moves to small intestine. – CHYMEd. Small Intestine: main point of digestion and absorption (60 ft.)1. Three Sectionsa. Duodenum: 1st, anteriorb. Jejunum: middlec. Ileum: end2. Digestion in SI- Poly peptides amino acids- Starch monosaccharaides/glucose- Lipids fatty acids3. Digestive Organsa. Gall Bladder: Secretes bile produced in liverb. Bile: encapsulates and degrades fatsc. Pancreas: secretes enzymes into the duodenum to breakdown
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