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 – (
Cecum – Digests fibrous material
Large Intestine – water absorption & feces formation

8. Video

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
Avian

16. Ruminant
four distinct compartments in its stomach, swallows unchewed, regurgitates it, chews it and reswallows it.
microorganisms break down cellulose

17. Ruminant Digestive Tract

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

19. 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

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

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

23. 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.

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

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

26. Video

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

28. 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?