The Digestive System

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The Digestive System
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Learning Objectives

• List the three types of digestive systems for
  animals.
• Describe the function of the digestive system.
• Name the parts of the digestive system in poultry
  and explain their function.

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Types of Digestive Tracts

• Monogastric one stomach
• Ruminant multiple chambers
• Modified Monogastric poultry/birds

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Function of Digestive Tract

• Provide nutrients to the body

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Modified Monogastric Poultry/Birds
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Mouth (beak)

• No teeth replaced by beak

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Esophagus

• The tube that connects the mouth with the rest of
  the body

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Crop

• Located in the neck region of the bird
• Part of the esophagus
• Used to store food until the bird is ready to
  digest more food
• Food is softened by saliva and secretions from
  the crop wall

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Proventriculus

• True Stomach
• Secretes enzymes
• Passageway between crop and gizzard

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Gizzard

• Unique to birds
• End of stomach before duodenum
• Made up of two smooth muscles
• Contains grit which acts as the birds teeth
• Feed is crushed and mixed with digestive juices

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Small Intestine

• Made up of two parts
• duodenum
• lower small intestine
• Important to absorb nutrients

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Ceca

• Have no real function

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Large Intestine

• Additional absorption of water

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Pancreas

• Located in the center of the duodenal loop
• Secretes pancreatic juice which neutralizes the
  enzymes secreted by the Proventriculus
• Helps break down fat

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Liver

• Produces a dark green substance called bile
• Bile is necessary for the absorption of fat
• Bile is stored in the Gall Bladder

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Cloaca

• The end of three different tracts
• digestive
• reproductive
• excretory

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