2 Carbohydrate Digestion

2 Carbohydrate Digestion - Carbohydrate Digestion Digestion...

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Unformatted text preview: Carbohydrate Digestion Digestion and Absorption Non-ruminant Ruminant CHO in feed digestive enzymes Glucose in small intestine Absorption into blood circulation microbial fermentation Volatile fatty acids in rumen Digestion of Carbohydrates Monosaccharides Do not need hydrolysis before absorption Very little (if any) in most feeds Di- and poly-saccharides Relatively large molecules Must be hydrolyzed prior to absorption Hydrolyzed to monosaccharides Only monosaccharides can be absorbed Non-Ruminant Carbohydrate Digestion Mouth Salivary amylase Breaks starches down to maltose Plays only a small role in breakdown because of the short time food is in the mouth Ruminants do not have this enzyme Not all monogastrics secrete it in saliva Carbohydrate Digestion Pancreas Pancreatic amylase Hydrolyzes alpha 1-4 linkages Produces monosaccharides, disaccharides, and polysaccharides Major importance in hydrolyzing starch and glycogen to maltose Polysaccharides Disaccharides Amylase Digestion in Small Intestine Digestion mediated by enzymes synthesized by cells lining the small intestine (brush border) Disaccharides Monosaccharides Brush Border Enzymes * Exception is -1,4 bonds in cellulose Digestion in Small Intestine Maltose Glucose + Glucose Maltase Lactose Lactase Glucose + Galactose * Poultry do not have lactase Sucrose Glucose + Fructose Sucras e * Ruminants do not have sucrase Digestion of Disaccharides Newborns have a full complement of brush-border enzymes Miller et al. (eds.), 1991 Digestion in Large Intestine Carnivores and omnivores Limited anaerobic fermentation Bacteria produce small quantities of cellulase SOME volatile fatty acids (VFA) produced by microbial digestion of fibers Propionate Butyrate Acetate Digestion in Large Intestine Post-gastric fermenters (horse and rabbit) Can utilize large quantities of cellulose Cecum and colon contain high numbers of bacteria which produce cellulase Cellulase is capable of hydrolyzing the beta 1,4- linkage Overview Monogastric Carbohydrate Digestion Location Enzymes Form of Dietary CHO Mouth Salivary Amylase Starch Maltose Sucrose Lactose Stomach (amylase from saliva) Dextrin Maltose Small Intestine Pancreatic Amylase Maltose...
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2 Carbohydrate Digestion - Carbohydrate Digestion Digestion...

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