EXAM 3: digestion and nutrition Flashcards
% lysine of the diet for the following conditions:
pelleted feed
crowded pen
hot environment
pelleted feed: less (cant pick out specific ingredients)
crowded pen: more (less eating because of stress/competition)
hot environment: more (eat less because of heat)
barrows need a _________% of lysine than gilts after _______ pounds
less
55-75
leaner pigs need a ___________% of lysine than fatter pigs, same weight
greater
as a pig gets __________, their need for total lysine per day increases, but because the pig eats ________ feed per day, the lysine percentage of the diet ___________
heavier
more
decreases
the digestive tract of a pig includes 5 main things
mouth
esophagus
stomach
small intestine
large intestine
The mouth is the first part of the digestive system and contains three parts associated with digestion
teeth
tongue
salivary glands
what do the teeth do for digestion
Reduce particle size of ingested feed
chewing
what does the tongue do for digestion
push consumed feed towards the esophagus
generates saliva
what do the salivary glands do for digestion
sublingual, mandibular and parotid
create saliva (watery, mucus like) to moisten feed and has the enzyme amylase (break starch)
boars produce more saliva
straight muscular tube that transports feed from the mouth to the stomach by peristaltic waves
esophagus
where is the cardiac valve/sphincter
end of esophagus
prevents food from passing from the stomach back up the esophagus
pear shaped musclar organ that stores ingested feed, moves feed and secretes gastric juices
stomach
~2 gallons, pH= 2
as feed leaves the stomach is pass through the _____________ into the small intestine
pyloric sphincter
what does the stomach secrete
HCl
digestive enzyme: pepsin (protein –> polypeptide)
mucus
where majority if digestion and absorption of nutrients occurs
small intestine
what are the three parts of the small intestine
duodenum
jejunum
ileum
**2.5 gallons, 60 ft long (surface area/allow time to digest)
role of the duodenum
first section of SI
mix with secretions from pancreas, bile and enzymes
role of the jejunum
middle
further breakdown
role of the ileum
final section
nutrient absorption continues
what four things does the pancreas produce/secrete
lipase= break fat
trypsin= break protein
amylase= break starch
chymotrypsin= break peptide
what 3 sections is the large intestine made up of
cecum
colon
rectum
the large intestine is important for
water absorption from ingesta
secrete some mineral elements
stores undigested material
source of limited microbial activity
role of cecum
2 sections: blind end and section that connects to the colon
makes from VFA and B vitamins
role of colon
largest portion of LI
major role in water absorption
form feces
