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Lecture 2

ANSC 101 Lecture Notes - Lecture 2: Trypsinogen, Ileum, Jejunum


Department
Animal Science
Course Code
ANSC 101
Professor
Kasey Moyes
Lecture
2

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Digestion and Absorption: Non-Ruminant Digestion
Ruminant
4 compartmentalized stomach; regurgitate
“Foregut” fermenters: cattle, sheep, deer
o Fermentation occurs near the beginning
Non-ruminant
Single-compartmentalized stomach
o Pigs, rodents, horses, chickens
Cecum size determines type of digester
o Carnivore, omnivores, herbivore
“Hindgut” fermenters: rodents, hamsters, and horses
o Fermentation occurs near the end
Cecum
Cecum in humans, but function isn’t clear
Highly variable between species
Hind gut bacterial fermentation
Evolutionary Variety
Ruminants beef/dairy cattle, sheep, goats
o Regurgitate
Foregut fermenting Pseudo Ruminants
o Do not regurgitate
o Llama, kangaroo, camel
Hindgut fermenting non-ruminants
o Do not regurgitate
o Horse, rabbit, and hamster
Poultry chicken, turkey, other birds
o Non-ruminants
Mouth
Teeth adapted to food
Tongue
o Taste, movement, grasp food
Saliva
o Lubrication, amylase (enzyme for starch digestion)
Esophagus
Swallowing
Peristalsis
o Throughout digestive system
o Rhythmic contraction of smooth muscle
Stomach
Gastric pit in stomach
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