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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 § 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 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?