ANIMAL DIGESTION Click the green arrow to begin

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What is animal digestion? Look at the pictures below: How does this relate to agriculture?

What is Animal Digestion � If you said: breaking down then you are correct � The actual definition is: process of breaking down food into simple substances that can be absorbed by the body Another part of digestion is absorption: -process of taking the digested parts of food into the bloodstream �

What is Animal Digestion? � A. breaking down of food � B. breaking down of liquid � C. breaking down of air

Correct! Great job! � The definition of animal digestion is: process of breaking down food into simple substances that can be absorbed by the body

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Digestive Systems � The digestive system consists of the parts of the body involved in chewing and digesting food. � Digested food moves through the animal’s body and absorbs the products of digestion

4 basic types � monogastric (simple) � ruminant (polygastric) � pseudo-ruminant � avian

Monogastric or simple �contains a single-chambered stomach �found in humans, swine, dogs, and cats.

Monogastric � What animals have a monogastric system?

Correct! Great Job! � Pigs, dogs, cats and humans have a monogastric digestive system

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Ruminant or polygastric � One large stomach divided into four compartments � found in cattle, sheep, and goats. � An animal with this kind of digestive system is called a ruminant

Digestive systems � The rumen is the largest section of the stomach � 60% of the stomach. �Contains bacteria and other microbes that promote fermentation �Food is ingested, eructated (belched up), chewed, and then swallowed again

Digestive systems � The reticulum �Has honeycomb-like ridges �Aids in keeping the food in the rumen mixed with water and saliva ○ Until it is the right consistency ○ Once the right consistency is reached, the mixture can pass on into the lower digestive tract

Digestive systems � The omasum is a small compartment � Main sight for water absorption �particles are squeezed and dehydrated, as well as sorted �The compartment acts as a filter for the abomasum

Digestive systems � The abomasum, or “true stomach, ” is the site of digestion �Secretes gastric juices consisting of hydrochloric acid and pepsin �The abomasum is similar to the stomach in a monogastric animal

Ruminant Digestive System � What are the four chambers of a ruminant stomach?

Correct! Great Job!! � Rumen, Reticulum, Omasum, and Abomasum

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Pseudo Ruminant �A pseudo-ruminant can utilize large amounts of roughages because of its greatly enlarged cecum and large intestine �Examples of pseudo-ruminants are horses, rabbits, guinea pigs, and hamsters.

Pseudo Ruminant � Why can pseudo ruminant’s consume large amounts of forages?

Correct! Great Job! � Pseudo ruminants can consume large amounts of forages because their enlarged cecum.

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Digestive systems � The avian digestive system � Found in poultry. �Since a bird has no teeth, no chewing is involved �The esophagus empties directly into the crop.

Digestive systems �The crop is where the food is stored and soaked �From the crop, the food makes its way to the gizzard �The gizzard-very muscular organ-which normally contains stones or grit that grinds the food �Digestion in the avian system is very rapid

Avian Digestive � Name two important parts of the avian digestive system where the food is stored and where the food is broken down.

Correct! � The crop stores the food and the gizzard breaks it down.

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