Chapter 30

Chapter 30 - Chapter 30 Nutrition and Digestion A...

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03/05/08 Chapter 30 Nutrition and Digestion A nutritionally adequate animal diet satisfies three needs: 1. Fuel (chemical energy) a. Need energy to repair b. Need energy to stay warm 2. Organic raw materials for biosynthesis (especially carbon based molecules) 3. Essential nutrients (substances that the animal needs but cannot synthesize from any precursors on its own) A nutritionally inadequate animal diet fails to satisfy the three basic needs we just covered. Undernourishment- insufficient calories (energy) Malnourishment- a diet missing one or more essential nutrients o Kraft dinner and Cokes all day Energy in nutrients is measured in Calories (kcal = energy to raise the temperature of 1 L of water 1 degree C. An “average” human body uses about 1,550 Calories/day. 03/07/08 Principle categories of nutrients: • Lipids- found in lipid membranes, etc.; including essential fatty acids o 9 calories per gram (a principal energy source) • Proteins- building blocks and enzymes; animals require 20 amino acids including essential amino acids o 4 calories per gram (usually a secondary energy source, since the breakdown of protiens produces urea,
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Chapter 30 - Chapter 30 Nutrition and Digestion A...

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