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ANS-311 Principles of Animal Nutrition
Lipids
19
Agriculture
Undergraduate 3
10/15/2011

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Term
Lipids
Definition
Insoluble in water. Hydrophobic. Soluble in ether
Solid/Liquid form (fat/oil)
Term
Glycolipids
Definition
"grass" CHO+lipid, found in plants.
Term
Lipoproteins
Definition
Protein+lipid. Transports lipids.
Term
Phospholipids
Definition
Lipid+phosphate group
Makes up cell membranes
Term
Examples of non-glycerol based lipids
Definition
wax, cholesterol, Vit D, pigments etc.
Term
Fatty Acid properties
Definition
Animals: more saturated fat
Plants: more unsaturated fat
Longer chain = liquid
Shorter chain = solid, tastes yummy
Term
Saturated
Definition
NO DOUBLE BONDS
Term
Unsaturated
Definition
DOUBLE BONDS
Term
Trans fats
Definition
Produced when polyunsaturated fats become hydrogenated.
Not very good.
Term
Natural trans fats aka CLA (Linoleic Acid)
Definition
Produced by rumen microbes biohydrogenation of CLA. Lacks a methlyene group sep. double bonds. "conjugated"
Term
Benefits of natural trans fats
Definition
In ruminant products. 16 isomers.
Anti-carcinogenic
fat-reduction, increase lean mass
Term
Essential fatty acids
Definition
1. Linoleic acid M
2. Linolenic acid M
3. Arachidonic acid (cats only)
Term
Difference between omega-3 and omega-6 fatty acids
Definition
Location of the double bond.
Omega-3: flax oil, fish oil
Omega-6: sunflower oil, corn oil
Term
Polyunsaturated fats benefits
Definition
Reduces triglycerides
anti-imflammatory
decrease atherogenesis
Term
Lipid Digestion
Definition
Lipase.
Term
Primary site of fat digestion
Definition
Small intestine (monogastrics)
Exception: pigs start in the stomach
Term
Lipid digestion
Definition
Emulsifies the fat (break it down) by bile salts. Specific enzymes cleave fatty acids off to form micelles.
Term
Lipid absorption
Definition
Micelles move toward sm. intestine surface, releases contents into cells. Bile salts return to liver. Packaged again into chylomicrons. Excreted into lymphatic circuluation
Term
Chylomicrons
Definition
Have to be packaged to go through the bloodstream. Proteins transport it around. Made in enterocytes (sm. I cells)
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