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11_Nutrition - Animal Nutrition and Digestion Home Page...

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1 Animal Nutrition and Digestion © 2006: D. Julian Home Page Fuel, raw materials and essential nutrients As heterotrophs , animals cannot make organic molecules from raw materials that are entirely inorganic . Each animal’s diet must satisfy the following three requirements: 1. Fuel (for regeneration of ATP from ADP) 2. Organic raw materials for biosynthesis 3. Essential nutrients (e.g., vitamins and minerals) However, the specific needs of different animals vary, even between species that are closely related. © 2006: D. Julian Forms of energy storage After the immediate nutritional needs of an animal are met, the body can store at least some of the available excess energy: 1. Glycogen (glucose polymer, especially in liver and muscle) 2. Fat (lipids have a very high energy content for their weight). © 2006: D. Julian
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