Total digestible nutrients (TDN) in a feed represent the sum of digestible protein, digestible carbohydrates, and:
Correct answer: C. Digestible ether extract multiplied by 2.25
- A. Undigested protein multiplied by 2.25
- B. Digestible ash multiplied by 2.25
- C. Digestible ether extract multiplied by 2.25
- D. Metabolizable energy multiplied by 2.25
Explanation
TDN includes digestible crude protein, fibre, nitrogen-free extract, and ether extract. Fat supplies about 2.25 times the energy of carbohydrates, so digestible ether extract receives this correction factor.
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About Animal Nutrition and Feeding
Covers carbohydrates, proteins, lipids, minerals, vitamins and water, along with digestion, absorption and energy metabolism in domestic animals. Questions involve feed evaluation, nutrient requirements, ration formulation, forage and concentrate feeds, deficiency disorders, and the differences between ruminant and monogastric nutrition.
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