ADSC 2010 Lecture 15 Outline of Last Lecture I Nutrient Utilization Requirements A Maintenance Requirements a Nutrients B Nutrient Utilization for Production II Digestion Movie A Prehension B Mastication C Monogastrics Poultry Outline of Current Lecture I Video Ruminants II Digestive Systems Monogastrics A Monogastrics B Component Functions a Mouth b Esophagus c Stomach d Small Intestine 1 Three Sections 2 Digestion in SI 3 Digestive Organs Current Lecture I Video Ruminants Esophagus 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 Monogastrics A Monogastrics simple stomached animals usually with an acid environment Examples Pigs horses chickens humans B Component Functions a 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 Stomach c 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 CHYME d Small Intestine main point of digestion and absorption 60 ft 1 Three Sections a Duodenum 1st anterior b Jejunum middle c Ileum end 2 Digestion in SI Poly peptides amino acids Starch monosaccharaides glucose Lipids fatty acids 3 Digestive Organs a Gall Bladder Secretes bile produced in liver b Bile encapsulates and degrades fats c Pancreas secretes enzymes into the duodenum to breakdown macromolecules
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