The Avian Digestive System

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• The Avian Digestive System
• By
• Gemma Dalena

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Overview of Information Presented

• The Avian Digestive System
• Parts of the Avian Digestive System
• Esophagus
• Stomach
• Small Intestine
• Large Intestine
• http//www.calaged.org/ResourceFiles/Curriculum/ad
  vcluster/3000.htm

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Information Guide

• All Information Provided by this PowerPoint
• Presentation can be found on the at
• http//www.calaged.org/ResourceFiles/Curriculum/a
  dvcluster/3000.htm
• Under the California Agriculture Core Curriculum
  Animal Science
• Animal Physiology (CLF3201) The Digestive
  Process

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The Avian Digestive System

• This digestive system is adapted for grinding
  hard or encased (shells of seeds) food.

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Parts of the Avian Digestive System

• The Mouth
• Saliva is secreted to moisten food and aid in
  swallowing since avian species do not have teeth.

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The Esophagus

• The Esophagus connects the mouth to the stomach.

Esophagus
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The Esophagus

• has a modification which is called the "crop"
  where food is stored and further moistened

Crop
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The Avian Stomach

• Consists of Two Parts

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The Avian Stomach

• Consists of two parts.
• 1.The "proventriculus" which provides digestive
  secretions.

Proventriculus
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The Avian Stomach

• 2. The "gizzard" which is located after the
  proventriculus, it is very muscular and is used
  for grinding food.

Gizzard
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The Small Intestine

• The small intestine varies in length depending on
  the diet. It is longer in herbivores (plant
  eating birds) and shorter in carnivores (flesh
  eating birds).

Part of the small intestine
Parts of the small intestine
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The Small Intestine

• The functions of the small intestine are similar
  to the small intestine of ruminants and
  monogastrics

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The Large Intestine

• The functions of the large intestine are similar
  to the small intestine of ruminants and
  monogastrics.

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The Large Intestine
Ruminants
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The Large Intestine
Monogastrics
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The Large Intestine

• The "cloaca" which, is located at the terminal
  end of the large intestine is a chamber into
  which the urinary and genital canals open.

Large Intestine
cloaca
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The Large Intestine

• At the junction of the small and large intestine
  is where the two "ceca" pouches are located.

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The Large Intestine

• The two ceca pouches further contribute to aiding
  in fiber digestion and absorption.

Ceca Pouch
Ceca Pouch