Overview

In Nutrient Requirements of Dogs and Cats (2006), the U.S. National Research Council (NRC) proposes a four-step method to estimate metabolizable energy (ME) with greater accuracy than the Modified Atwater approach. This method adjusts predicted digestibility based on crude fiber content and applies species-specific corrections for urinary energy losses, which differ between dogs and cats.

NRC 2006 (CF) ME Calculator

Species
NFE = 100 − (CP + Fat + CF + Ash + Moisture).
Calculations are performed on a dry matter (DM) basis internally.
- kcal/kg
NRC 2006 (CF) / Dog (as‑fed)
Dry matter (DM%)
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ME (kcal/kg DM)
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GE (kcal/100g DM)
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Digestibility (%)
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DE (kcal/100g DM)
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ME (kcal/100g DM)
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CP_DM（%）
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Fat_DM（%）
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CF_DM（%）
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NFE_DM（%）
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Digestibility: Dog = 91.2 − 1.43×CF_DM; Cat = 87.9 − 0.88×CF_DM.
Urinary loss correction: Dog = 1.04×CP_DM; Cat = 0.77×CP_DM.
NRC2006の詳細記事
ペットフードのカロリー計算式とMEの実務的理解と応用