click below
click below
Normal Size Small Size show me how
Lecture 3 9/2/11 E1
Carbohydrates
Question | Answer |
---|---|
Carbohydrate Composition | -made of C, H, O [roughly Cn(H2O)n] |
Carbohydrates in Feed | -primary component in livestock feeds/largest part of animal's food supply :present in forages, grains, & oilseed meals :generally cheapest source of available energy :generally main source of energy |
Where are Carbohydrates created | plants-photosynthesis -6CO2 + 6H2O + Solar Energy -> C6H12O6 |
Monosaccharide | -glucose -fructose -galactose -mannose -arabinose -xylose |
Disaccharide | -sucrose -maltose -celloboise -lactose |
Polysaccharide | -starch -fiber -glycogen |
Starch | -plant energy storage -major component of livestock diets (cereal grains & tubers) -a non-structural carbohydrate -highly digestible -composed of glucose units |
Fiber | -cellulose(glucose units), hemicellulose(mixed sugars), pectin, fructan, etc. -in plant cell walls (lignin) -a structural carbohydrate -non-digestible (requires microbial enzymes-digest beta linkages) |
Glycogen | -animal "starch" -produced in muscle and liver -carbohydrate reserve in the animal body -hydrolyzes to glucose |
Effects of Maturation on Grasses | -Concentration of NDF and Lignin increases -CP decreases |
Lignin | -not a carbohydrate (part of plant structure/considered with fiber) -mostly indigestible by livestock and microbes -reduces digestibility of fiber -increases as plants mature |
Pectin | -considered with fiber -located in matrix in plant cell walls -soluble and easily fermented |
Carbohydrate Summary | -organic nutrient -provides most of the energy in livestock diets -sugars and starches(digested or fermented) -fiber(fermented to VFA by microbes) -Ligin(not a carbohydrate, reduces digestibility of fiber) |