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Animal Digestive Systems

Animal Digestive Systems. Ag Science Mr. Dieckhoff. Objectives. Know the different types of digestive systems of livestock, small animals, and birds. What organs are important for food digestion? Describe how food moves through the digestive system of various animals.

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Animal Digestive Systems

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  1. Animal Digestive Systems Ag Science Mr. Dieckhoff

  2. Objectives • Know the different types of digestive systems of livestock, small animals, and birds. • What organs are important for food digestion? • Describe how food moves through the digestive system of various animals.

  3. Different Types of Digestive Systems • Monogastric • Pigs, dogs, cats, horses • Avian (Chicken, turkey) • Ruminant • Cattle, sheep, deer

  4. Monogastric • Have only one compartment in their stomach • Digests grains easily using amylase starting in the mouth • Does not digest forages & fibers easily (unless have enlarged Cecum)

  5. Monogastric Digestive Tract Test

  6. What do each of these organs do…. • Mouth – must chew food very well • Esophagus – Transports food to stomach using paralysis • Stomach (1 compartment) – secretes hydrochloric acid to break down nutrients, pepsin to break down proteins, renin to break down milk

  7. What do each of these organs do…. • Small Intestine– further breaks down nutrients and absorbs nutrients into blood stream • Duodenum – place where bile (from gall bladder) mixes with fats • Jejunum – (https://www.youtube.com/watch?v=oHulRDk__ko) • Cecum – Digests fibrous material • Large Intestine– water absorption & feces formation

  8. Video • https://www.youtube.com/watch?v=8lqk7igz9L4

  9. Avian • §Type of monogastric – but many new organs • §Crop – part of the esophagus – stores and moistens food • §Proventriculus – similar to the stomach in monogastric animals. Provides digestive secretions • §Gizzard – located after the proventriculus, very muscular, used to grind food

  10. Ruminant • four distinct compartments in its stomach, swallows unchewed, regurgitates it, chews it and reswallows it. https://www.youtube.com/watch?v=FPCaalSzEE0 • microorganisms break down cellulose

  11. Ruminant Digestive Tract

  12. STOMACH COMPARTMENTS Rumen (80% of capacity) Reticulum (5% of capacity) Omasum (7% of capacity) Abomasum (8% of capacity)

  13. Compartment 1:Rumen • Large fermentation vat • Microorganisms break down cellulose • Bacteria, protozoa • Creates lost of gases (methane) • Ruminants have to be able to eructate (belch) • Roughages are reduced in size • Hole in stomach video

  14. Gas Today’s Hay Yesterday’s Feed Rumen Feed Storage

  15. The rumen does not develop in the young until they are weaned and begin to eat solid feed

  16. Compartment 2: Reticulum • Collects objects that shouldn’t be in the digestive system. • Nails • Screws • Baling wire • Magnets are placed into many dairy animals reticulum.

  17. Compartment 3: Omasum • Works to remove water from the food • Absorbs fatty acids

  18. Compartment 4: Abomasum (True Stomach) • Glandular Stomach (like yours) • Secretes digestive juices. • Breaks down food stuff further for absorption. • Absorbs some nutrients.

  19. Video • http://www.youtube.com/watch?v=SVNNJf_28KE

  20. Order that food moves. • Rumen • Reticulum • Omasum • Abomasum Hint to remember Alphabetically back-words. Ru Re O A

  21. Review Questions • 1. What are the two primary types of digestive systems and give two examples of animals that have each type?  • 2. What organs are in the digestive tract of Monogastrics? • 3. What are the four compartments of a ruminant digestive stomach?

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