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Animal Science Feeds
Chapter 2 vocabulary
39
Science
Undergraduate 3
01/24/2012

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Term
gastrointestinal
Definition
pertaining to the stomach and intestine
Term
digestion
Definition
the process involved in preparing food for absorption
Term
mastication
Definition
chewing
Term
absorption
Definition
the movement of nutrients (or other compounds) from the digestive tract (or through other tissues such as the skin) into the blood and/or lymph system
Term
herbivores
Definition
consume primarily plant materials
Term
carnivores
Definition
eat other animals
Term
ominivores
Definition
eat a combination of plants and animal matter
Term
monogastric
Definition
the simple stomach; often applied to nonruminant animals, but technically a misnomer because ruminants have only one stomach with four compartments
Term
nonruminant
Definition
a.k.a. monogastric
Term
ruminant
Definition
any of a group of hooved mammals that has a four-compartmented stomach and that chew a cud while ruminating
Term
mouth
Definition
initial component of the GIT of mammalian and avian species
Term
rumination
Definition
the process of regurgitating preciously eaten feed, reswallowing the liquids, and rechewing the solids (cud)
Term
saliva
Definition
added during the process of mastication primarily from three bilaterial pairs of salivary glands present in the mouth
Term
stomach
Definition
the part of the digestive tract in which chemical digestion in initiated in most animal species. It normally lies between the esophagus and the small intestine
Term
nonglandular region
Definition
first region found in the stomach in which no digestive secretions are produced or absorption occurs
Term
cardiac region
Definition
second region of the stomach whihc is lined by epithelial cells that primarily secrete mucin
Term
fundic region
Definition
third region of the stomach which has three types of cells: parietal, neck chief, and body chief cells
Term
parietal cells
Definition
found in the third region of the stomach and secrete mucin
Term
body chief cells
Definition
found in the third region of the stomach and secret pepsinogen, rennin, and lipase
Term
pepsin
Definition
a proteolytic enzyme produced by the stomach
Term
rennin
Definition
a milk-curdling enzyme present in the gastric juice of young mammals
Term
mucin
Definition
coasts the lining of the stomach and prevents the tissue from being digested by the digestive secretions produced by the other tissues found in the stomach
Term
lipase
Definition
a fat-splitting enzyme; different forms are produced by the stomach and pancrease
Term
pyloric
Definition
fourth region of the stomach; has only neck chief and body chief cells
Term
chyme
Definition
a semi-liquid material produced by the action of gastric juice on ingested food
Term
small intestine
Definition
the primary site for enzymatic digestion in the GIT
Term

duodenum

jejunum

ileum

Definition
three sections of the small intestine in order
Term
bile
Definition
a secretion from the liver containing metabolites such as cholesterol and bile acids which aid in the digestion of fats
Term
gallbladder
Definition
a membranous sac attached to the liver of farm livestock (except for th horse) in which bile is stored
Term
emulsification
Definition
essential for fats efficient digestion and absorption of dietary fats, involves bile
Term
villi
Definition
small thread-like projections attached to the interior of the wall of the small intestine to increase its absorptive surface area
Term
large intestine
Definition
made up of cecum, colon, and rectum; microbial digestion is the primary mode of digestion that occurs in this region
Term
coprophagy
Definition
the practice of an animal consuming its own feces which allows the essential nutrients refulting from microbial fermentation to be passed through the GIT and subjected to the digestive and absorptive processes again
Term

reticulum

rumen

omasum

abomasum

Definition
fours parts of a ruminant stomach in order
Term
papillae
Definition
tonguelike projections that line the rumen
Term
abomasum
Definition
functions similar to that of the glandular stomach of nonruminants
Term
eructation
Definition
belching of gas by ruminants as a normal means of expelling gases of fermentation
Term
symbiotic relationship
Definition
a relationship that is beneficial to both the host animal and the microbial population
Term
volatile fatty acids
Definition
acetic, proprionate, abd butyric acid; absorbed and used as the primary energy source by ruminant animals
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