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Related Concept Videos

Production Efficiency01:01

Production Efficiency

Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
Protein Digestion01:02

Protein Digestion

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Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
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What is Monogastric Digestion?

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Carbohydrate Digestion00:57

Carbohydrate Digestion

Carbohydrate digestion and metabolism break down simple and complex carbohydrates from food into saccharides (i.e., sugars) for the body to use as energy. Carbohydrate digestion starts in the mouth during mastication, or chewing. The masticated carbohydrates remain intact in the stomach. Digestion resumes in the duodenum of the small intestine, where pancreatic alpha-amylase and brush border enzymes of the microvilli convert complex carbohydrates to monosaccharides. Finally, the monosaccharides...
Energy Balance01:19

Energy Balance

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Related Experiment Video

Updated: Jun 17, 2026

Quantifying Plant Soluble Protein and Digestible Carbohydrate Content, Using Corn (Zea mays) As an Exemplar
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Carnivorous mammals: nutrient digestibility and energy evaluation.

Marcus Clauss1, Helen Kleffner, Ellen Kienzle

  • 1Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland. mclauss@vetclinics.uzh.ch

Zoo Biology
|January 15, 2010
PubMed
Summary

Estimating metabolizable energy (ME) in wild carnivores is feasible using Atwater factors for raw meat, fish, or whole prey diets. This avoids the need for digestion trials, but research on complex diets is lacking.

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Area of Science:

  • Comparative nutrition
  • Animal physiology
  • Wildlife biology

Background:

  • Accurate energy content estimation is crucial for diet formulation in captive wild animals.
  • Understanding energy requirements aids in maintaining animal body condition and health.
  • Existing methods for domestic carnivores may not directly apply to diverse wild carnivore species.

Purpose of the Study:

  • To assess protein and fat digestibility differences across wild carnivore groups.
  • To determine if Atwater factor-based metabolizable energy (ME) estimation methods for domestic carnivores are applicable to wild carnivores.
  • To evaluate the feasibility of estimating ME without empirical digestion trials.

Main Methods:

  • Collated data on nutrient composition and digestibility coefficients from 45 species across 74 publications.
  • Analyzed regressions of digestible protein/fat content versus crude protein/fat content.
  • Applied Atwater factors (16.7 kJ/g CP; 16.7 kJ/g NFE; 37.7 kJ/g crude fat) for ME estimation.

Main Results:

  • No significant differences in protein or fat digestibility were found between wild carnivore groups.
  • Atwater factor-based ME estimates for raw meat, fish, or whole prey diets closely matched experimental results.
  • Highly digestible zoo diets offer limited potential for comparative nutrition research.

Conclusions:

  • Metabolizable energy (ME) estimation for wild carnivores on simple, raw diets is feasible using Atwater factors, negating the need for digestion trials.
  • Further research is needed on diets with higher proportions of indigestible components like fiber and connective tissues.
  • Comparative nutrition studies may benefit from diets with increased complexity to reveal species-specific differences.