Transcript Digestive System Notes - Harrisonville Schools

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.
Different Types of Digestive
Systems
Monogastric
Pigs, dogs, cats, horses
Ruminant
Cattle, sheep, deer
Avian
Chicken, turkey
Monograstric
Have only one
compartment in
their stomach
Digests grains and
protein easily using
amylase
Does not digest
forages & fibers
easily (unless have
enlarged Cecum)
Monogastric Digestive Tract
Test
What do each of these organs do….
Mouth – must chew food very well
Esophagus – Transports food to stomach
Stomach (1 compartment) – secretes
hydrochloric acid to break down nutrients,
pepsin to break down proteins, renin to break
down milk
Small Intestine – further breaks down
nutrients and absorbs nutrients into blood
stream
Duodenum – place where bile mixes with fats
Cecum – Digests fibrous material
Large Intestine – water absorption & feces
formation
Video
https://www.youtube.com/watch?v=8lq
k7igz9L4
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Type of monogastric –
but many new organs
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Crop – part of the
esophagus – stores and
moistens food
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Proventriculus – similar
to the stomach in
monogastric animals.
Provides digestive secretions
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Gizzard – located after
the proventriculus, very
muscular, used to grind food
Avian
Ruminant
four distinct compartments in its stomach,
swallows unchewed, regurgitates it, chews it
and reswallows it.
microorganisms break down cellulose
Ruminant Digestive Tract
STOMACH COMPARTMENTS
Rumen
Reticulum
Omasum
Abomasum
(80% of capacity)
(5% of capacity)
(7% of capacity)
(8% of capacity)
Compartment 1:Rumen
Large fermentation vat
Microorganisms break
down cellulose
Creates lost of gases
(methane)
Ruminants have to be
able to eructate (belch)
Roughages are reduced
in size
Hole in stomach video
Rumen Feed Storage
Gas
Today’s Hay
Yesterday’s Feed
The rumen does not develop in the
young until they are weaned and begin
to eat solid feed
Compartment 2: Reticulum
Collects objects that
shouldn’t be in the
digestive system.
Nails
Screws
Baling wire
Magnets are placed
into many dairy
animals reticulums.
Compartment 3: Omasum
Works to remove
water from the food
Absorbs fatty acids
Compartment 4: Abomasum
(True Stomach)
Glandular Stomach (like yours)
Secretes digestive juices.
Breaks down food stuff further for
absorption.
Absorbs some nutrients.
Video
http://www.youtube.com/watch?v=SVN
NJf_28KE
Order that food moves.
Rumen
Reticulum
Omasum
Abomasum
Hint to remember
Alphabetically backwords.
Ru Re O A
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?