Livestock Nutrition:Digestive System

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Livestock NutritionDigestive System
Created by Arlene Barrett, Dennis Bratton,
Mariah Gumphery ,Haley Vrazel
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Objectives

• Summarize terms related to digestive system.
• Review the digestive system.

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Terms

• Nutrient
• Nutrition
• Gastrointestinal Tract
• Digestive Stystems

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Nutrient

• A substance or group of substance of similar
  chemical structures that aid in the support if
  life.

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Nutrition

• A science that deals with the way an animal
  brings in a feed stuff and utilizes it through
  various processes and metabolic activities.

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Gastrointestinal Tract

• A tube that allows feed stuff to be stored
  (middle) digested (middle), absorbed (middle) and
  excreted (exit).
• A tube with a hollow cavity with a portion in the
  middle with cavities that are followed with an
  outlet.

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Digestive Systems

• Man and pig have a simple stomachs
  (non-ruminants) with an extensive intestinal
  system
• Ruminants have a complex stomach with a simpler
  intestinal system

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Digestive System

• Mouth Prehension tool (grasps food)
• Salivary glands secrete juices containing enzymes
  (digest food)
• Chewing food breaks down
• Esophagus muscular tube that connects mouth to
  stomach
• Peristaltic Movement sequential contraction of
  ringlike muscles
• Reverse Peristalsis vomiting

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2 Major Digestive Systems

• Both systems will be addressed in detail in the
  lesson to follow
• Ruminants (Polygastrics)have four stomach
  compartments
• Non-Ruminats (Monogastrics)have one stomach
  compartment

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Digestive System

• Small Intestine long coiled tube connecting
  stomach to large intestine
• rest of the digestion and absorption takes place
  here
• surface covered with villi (increase surface area
  and absorption)
• Large Intestine Cecum, colon, rectum
• absorbs water (makes feces more solid)
• some vitamins and minerals absorbed here

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Digestive System

• Accessory organs
• Pancreas secretes enzymes to break down fat
• Liver (largest internal organ) secretes bile,
  which digests fats
• also stores iron

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Review

• Summarize terms related to digestive system.
• Review the digestive system.

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Lab Activity

• Students will illustrate the swine and cattle
  digestive system.