Date post: | 03-Jan-2016 |
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Today’s Objectives
• Define a digestive system and what it does• Identify parts of the digestive system and their
functions• Difference between a Ruminant vs. Non-Ruminant
vs. Hind-gut Fermenter• Identify the difference in digestive systems
between Ruminant vs. Non-Ruminant vs. Hind-gut Fermenter
• Identify parts of the digestive system in a Ruminant vs. Non-Ruminant
Digestive System-What is it?
• Consists of parts of the body involved in chewing and digesting food
• Moves the digested feed through the animal’s body and absorbs the products of digestion
Parts of the digestive System
• Mouth-where the food enters the animals body
• Esophagus-tube like passage from the mouth to the stomach
• Stomach-receives the feed and adds chemicals that help in the digestive process
Parts of the digestive system
• Small Intestine- small tube that splits food molecules and absorbs nutrients
• Large Intestine-larger in diameter and ends with the rectum
• Rectum-end of GI tract, place where feces exits body
Digestive System
Ruminant vs. Non-Ruminant vs. Hind-gut Fermenter
Digestion in Ruminants
•
What is a Ruminant?
• Animals with more then one stomach
• Chew their cud
• Cows have 4 Compartment stomachs– Reticulum– Rumen– Omasum– Abomasum
Cattle Digestive System
Reticulum
• Honeycomb lining
• Collects hardware (nails, wires, etc.)
• Stores, sorts, and moves feed back to the esophagus for regurgitation
Rumen
• Papillae lining
• Functions as a storage vat
• Food is soaked, mixed, and fermented
• Some breakdown of feed through microbial action
• Absorption of some nutrients
Omasum
• AKA: Many plies
• Laminae lining (many folds)
• Reduces particle size
• Grinds Roughage
• Absorption of water
Abomasum
• Only “true” stomach
• Feed is mixed with gastric juices
• Decrease pH from 6 to 2.5– Denatures protein– Kills bacteria and Pathogens– Dissolves minerals
Digestion in Non-Ruminants
Swine Digestive System
Non-Ruminants
• Monogastric System• Has only one compartment to the stomach• Process goes through the
– Esophagus– Stomach– Small intestine- duodenum, jejunum, ileum– Large intestine: cecum (appendix in humans),
colon, rectum
Hind-gut Fermenter
• Enlarged Cecum– Acts as a rumen in ruminants– Not as efficient as rumen– Roughage feeds are digested by bacterial action
• Animal eats less, but more often than ruminants
• Animal is able to utilize roughages unlike non-ruminants
•
How digestion works
• Feed passes from mouth to esophagus then to stomach
• Partly digested food leaves stomach enters into small intestine– Splitting of foods molecules and absorption of
nutrients– Stomach empties contents into small intestine
known as the duodenum-jejunum-ileum
How digestion works
• Small intestine to Large intestine– Colon prevents material in large intestine from
moving back to small intestine
• Cecum-(blind gut) does little for most animals except horses-roughage feeds digested by bacterial action
How Digestion Works
• Large Intestine-absorbs water and nutrients that is not absorbed by the small intestine– Material that is not digested and absorbed in
small intestine passes to large intestine– Adds mucus to enable the material to pass
through easily– Empties into the rectum
In Conclusion• Ruminants and Non-Ruminants have
different digestive systems• Why is the digestive system important?• How many stomachs does a Ruminant
have? Non-Ruminant?• What makes a Horse different then other
animals?• Category