Animal Digestion

1. Animal Digestion AGR Veterinary Science Credit the University of Kentucky for some of slides in the presentation for this class

2. Types of Digestive Systems Chickens Pigs Beef Cattle Dairy Cattle Horses Turkeys Dogs Goats Sheep Rabbits Cats Ostrich Deer Hind Gut Fermentors Monogastrics Ruminants

3. Liver Pancreas Cecum Rectum Esophagus Stomach Duodenum Colon Small intestine (jejunum, ileum) Digestive Tract - Pig

4. Gall bladder Liver Cecum Gizzard Esophagus Crop Proventriculus Cloaca Pancreas Large intestine Duodenum Small intestine (jejunum, ileum) Digestive Tract - Poultry

5. Cloaca Crop Gizzard Proventriculus Specialized Poultry Organs

6. Proteins Fats Starch Maltose Peptides Amino acids Fatty acids Glucose = main site of absorption Digestive Process - Monogastrics MOUTH amylase STOMACH proteases SMALL INTESTINE amylase maltase bile salts lipases peptidases

7. Small intestine Rumen Rectum Pancreas Omasum Esophagus Large intestine Reticulum Abomasum Cecum Liver Gall bladder Digestive Tract – Beef Cattle

8. = main site of absorption = some absorption = microbial action; RDP = rumen degraded protein; RUP = rumen undegraded protein; Digestive Process - Ruminants Nonprotein N (NPN) Feed proteins Carbohydrates Fats RUMEN/ RETICULUM RDP RDP Cellulose Starches Hemicellulose Sugars RUP Volatile fatty acids (VFA’s) Microbial protein (essential AA) Glucose LIVER Glucose OMASUM VFA’s ABOMASUM RUP Microbial protein Peptides Fats SMALL INTESTINE Peptides Fatty acids & glycerol Amino acids Glucose

9. Small intestine Rectum Cecum Esophagus Stomach Small colon Duodenum Large colon Digestive Tract - Horse

10. Proteins Starch Cellulose Hemicellulose Fats Maltose Peptides Glucose Amino acids Fatty acids VFA’s VFA’s = microbial action = main site of absorption Digestive Process – Hind Gut Fermentors MOUTH amylase STOMACH proteases amylase maltase SMALL INTESTINE peptidases bile salts lipases LARGE INTESTINE

11. Digestive System Comparisons

12. Digestive Tract Capacities