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Lecture 5 9/9/11 E1

Lipids

QuestionAnswer
Lipids -not soluble in water -soluble in organic solvent(ether) -2.25x more energy than carbohydrates
2 Kinds of Lipids -saturated -unsaturated
Saturated Lipids -two hydrogen per carbon -no double bonds
Unsaturated Lipids -may have one hydrogen per carbon -leads to double bonded carbons -kinked
Fats solid at room temp
Oils liquid at room temp
Lipid Functions -energy source -membranes, generate heat, insulation, body protection, precursor for steroid hormones, energy storage -carrier for absorption of fat-soluble vitamins -regulatory compounds
Essential Fatty Acids (EFA) -Linoleic acid(C18:2 n-6) -Linolenic acid(C18:3 n-3) -Arachidonic acid(C20:4 n-6)
Leptin -an adipose derived hormone -important in regulating appetite and metabolism
Risks of Lipid Consumption -increased risk of cardiovascular disease & colon cancer -high intake of saturated fats(trans. fats), cholesterol -reduces feed intake -causes diarrhea
Benefits of Lipid Consumption N-3 polyunsaturated fatty acids and conjugated linoleic acid -improved immune funtion, anti-cancerogenic, anti-atherogenic -fich and ruminant(CLA) products
Lipids in Animal Diets -concentrated energy source -low quantity(<8%) -young animals us 25-40%
Lipids in the Rumen -fats are biohydrogenated in the rumen :reduces double-bonds to make more saturated, which makes lipids flowing to small intestine more saturated than non-ruminants
Lipid Summary -organic nutrient -concentrated energy source -limited(but can be important) use in livestock diets(except in youngins)
Created by: ickbutt
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