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Equine Gastrointestinal Anatomy
part of test 2
98
Agriculture
Undergraduate 4
03/05/2017

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Term
horses have lips for...
Definition
prehension
Term
horses chew more for ______ than ______
Definition
roughage
concentrates
Term
are horses ruminants?
Definition
no
Term
this stimulates saliva in horses
Definition
Physical presence of feed
Term
amount of saliva produced by horses per day
Definition
2.4-3.2 gal per day
Term
enzymatic activity of horse saliva
Definition
Little to no enzymatic activity
Term
function of horse saliva in digestive system
Definition
Provides lubrication and buffers proximal stomach
Term
a chemical horse saliva contains
Definition
sodium bicarbonate
Term
c'tration of sodium bicarbonate in horse saliva is directly proportional to...
Definition
rate of secretion
Term
function of horse esophagus
Definition
Transports food from mouth to stomach by muscular contractions
Term
horse esophagus located on...
Definition
left side of trachea
Term
depiction of the equine digestive tract
Definition
[image]
Term
Esophageal Impaction (Choke) in horses
Definition
Foreign object or feed lodging in esophagus
Term
some things that can cause Esophageal Impaction (Choke) in horses
Definition
-rapid eating
-poor dentition
-inadequate water
-consumption of bedding
Term
what Esophageal Impaction (Choke) may do to horses
Definition
-May damage esophagus
-regurgitation of food from mouth and nostrils
Term
where most of the digestion occurs in horses
Definition
hindgut
Term
which part of the horse digestive system is number 1?
[image]
Definition
esophagus
Term
which part of the horse digestive system is number 2?
[image]
Definition
stomach
Term
which part of the horse digestive system is number 3?
[image]
Definition
small intestine
Term
which part of the horse digestive system is number 4?
[image]
Definition
cecum (on right side of body cavity)
Term
which part of the horse digestive system is number 5?
[image]
Definition
small colon
Term
which part of the horse digestive system is number 6?
[image]
Definition
large colon
Term
which part of the horse digestive system is number 7?
[image]
Definition
rectum
Term
how long food remains in horse stomach
Definition
Digesta remains a short time, dependent on feedstuff
Term
types of sphincters in horse stomach
Definition
-Cardiac
-Pyloric
Term
types of mucousal surfaces in horse stomach
Definition
-Squamous
-Glandular
Term
function of the squamous region of horse stomach
Definition
mostly for absorption
Term
the regions on the glandular surface of the horse stomach
Definition
-fundic
-pyloric
Term
function of the fundic region of the glandular surface of the horse stomach
Definition
fluids procuced here
Term
pyloric region of the glandular surface of the horse stomach produces...
Definition
gastrin
Term
types of cells in fundic region of the glandular surface of the horse stomach
Definition
-parietal
-chief
Term
Parietal cells produce...
Definition
HCl
Term
Chiefpepsin cells produce...
Definition
pepsin
Term
empty pH in horse stomach
Definition
1.5-2.0
Term
size of stomach in horse digestive tract
Definition
Small! – 8-10% of GI tract
Term
how long feed can stay in rumen
Definition
Feed can stay in rumen for couple days
Term
size of small intestine in horse digestive tract
Definition
Approximately 70 feet (30% tract)
Term
rate of passage in horse digestive tract
Definition
rapid
Term
Sections of the horse small intestine
Definition
-duodenum
-jejunum
-ileum
Term
in the horse digestive system, the small intestine is the primary site of digestion and absorption of...
Definition
-Fat
-soluble CHO
-protein
Term
some Enzymatic secretions that are secreted into the small intestine
Definition
-Pancreatic juice
-bile
-Disaccharidases
Term
activity level of pancreatic juices in horses
Definition
Low activity
Term
some pancreatic juices secreted into the small intestine
Definition
-trypsin
lipases
-amylases
-alkali
-bicarbonates
Term
where bile comes from
Definition
liver
Term
what bile is designed to do
Definition
emulsify fats
Term
the activity of disaccharidases secreted into the horse small intestine changes with...
Definition
age
Term
function of the trypsin, lipases, and amylases secreted by the pancreas into the small intestine
Definition
digestion of fats, proteins, and carbohydrates
Term
function of alkali and bicarbonates secreted by pancreas into small intestine
Definition
buffer the acid ingesta leaving the stomach
Term
size of larfe intestine compared to horse digestive system
Definition
65% of tract
Term
sections of the horse large intestine
Definition
-cecum
-large colon
-small colon
Term
the digestion that occurs in the horse large intestine
Definition
fermentative digestion
Term
how long food can stay in the horse large intestine
Definition
60 hours
Term
in horses, the fermentation of digesta is beneficial for...
Definition
structural CHO
Term
VFA
Definition
volatile fatty acids
Term
some types of microbes that live in the horse large intestine
Definition
-protozoa
-bacteria
Term
protozoa help digest...
Definition
fiber
Term
is defaunation of protozoa in the horse large intestine harmful?
Definition
no
Term
the amount of bacteria in the large intestine of a horse is influenced by...
Definition
diet
Term
one way impactions in the horse large intestine can occur
Definition
Impactions can occur in horses normally fed grain, then hay
Term
some conditions that can happen in the large intestine in horses that are fed hay then grain
Definition
Laminitis and colic
Term
the 2 comon probems with horse feeding
Definition
Impactions can occur in horses normally fed grain, then hay
Laminitis and colic in hay to grain fed horses
Term
Gastrin
Definition
hormone which secretes gastric acid – 10-30 liters. Continues during feeding
Term
some fermentation products
Definition
-VFA (volatile fatty acids)
-Electrolytes
-Water
Term
some VFA (volatile fatty acids)
Definition
-Acetate
-propionate
-butyrate
-lactate
Term
size of GI tract in neonatal foal
Definition
3.5% BW is GI tract, 3.5% liver
Term
size of stomach in neonatal foal
Definition
Stomach greater than 10% of GI tract
Term
what large liver does for neonatal foal
Definition
provides nutrients
Term
what happens to size of GI tract and liver as foal matures to mature horse?
Definition
Tract increases in size while liver remains the same
Term
size of small intestine increases until...
Definition
4 weeks of age
Term
why size of small intestine increases with age
Definition
because of the horse eating more
Term
why forages are necessary for feeding horses
Definition
-Maintain gut health
-Decreases vices
Term
weight of forages that horses should consume
Definition
Minimum 1% of body weight
Term
how grain should be used in terms of feeding horses
Definition
Use to supplement pasture/hay program; not a necessity
Term
amount of grain a horse should consume
Definition
No more than 0.75% BW at one time
Term
how often a horse should consume grain
Definition
Evenly spaced, regular feedings
Term
the amount of food a horse should consume
Definition
Total diet: 2-2.5% BW
Term
how the feed or amount of feed given to a horse should be changed
Definition
Change type of feed or amount gradually over 1 week
Term
why the feed or amount of feed given to a horse should be changed gradually over 1 week
Definition
Avoids digestive upsets
Term
amount of time needed for a horse to adapt to dietary changes
Definition
at least 3 weeks
Term
for horses, protein ______ is more important than ______
Definition
quality
quantity
Term
the first limiting amino acid for horses
Definition
lysine
Term
how much most horses eat
Definition
~3% of BW
Term
percent of forage and concentrate needed for weanling horses
Definition
30% forage, 70% concentrate
Term
percent of forage and concentrate needed for yearling horses
Definition
40% forage, 60% concentrate
Term
why horses pursue more roughage as they get older
Definition
because as the animal grows, the hindgut increases in size
Term
in horses, complex carbohydrates are digested at...
Definition
the back end
Term
in cows, complex carbohydrates are digested at...
Definition
the front end
Term
function of mouth in horses
Definition
reduction of particle size,no remastication
Term
function of mouth in ruminants
Definition
remastication
Term
function of stomach in horses
Definition
protein and starch digestion, lip metabolism
Term
function of stomach in ruminants
Definition
lipid, sugar, protein + CHO, there are some energy losses, microbial FA and proteins are also produced. These are digested in lower GI
Term
function of small intestine in horses
Definition
absorbtion of lipids and proteins
Term
function of small intestine in ruminants
Definition
absorbtion of lipids and proteins
Term
function of large intestine in horses
Definition
micorbial degradation and absorption of FA
Term
Pancreatic juice stimulated by...
Definition
presence of feed in stomach, secretion continuous but gets heavier with food
Term
pancreatic secretion gets heavier with...
Definition
food
Term
Bile comes from...
Definition
gastric HCl in duodenum
Term
when secretion of bile ceases
Definition
secretion ceases after 48 hr fast
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