{"topic_id":"FEDIAF_2025_dietary_energy_atwater","category":"fediaf","context":"FEDIAF 2025 uses the modified Atwater method — ME (kcal/100 g) = (3.5 × % crude protein) + (8.5 × % crude fat) + (3.5 × % NFE) — as one of its predictive approaches for metabolizable energy, the same 3.5/8.5/3.5 factors that AAFCO Model Regulation PF9 adopts for US pet food (ME kcal/kg = 10[(3.5 × CP) + (8.5 × CF) + (3.5 × NFE)]); there is therefore no systematic FEDIAF-vs-AAFCO ME gap from the carbohydrate factor. For higher accuracy FEDIAF recommends the NRC 2006 predictive equations (the basis of European Standard EN 16967): GE (kcal) = 5.7 × %CP + 9.4 × %CF + 4.1 × (%NFE + % crude fibre); energy digestibility = 91.2 − 1.43 × %CF in DM (dogs) or 87.9 − 0.88 × %CF (cats); DE = GE × digestibility/100; ME = DE − 1.04 × %CP (dogs) or DE − 0.77 × %CP (cats). For single-ingredient or highly digestible products (meat, offal, milk products, cooked starch, milk substitutes, enteral diets), separate equations apply: dogs ME = 4 × %CP + 9 × %CF + 4 × %NFE; cats ME = 4 × %CP + 8.5 × %CF + 4 × %NFE. Feeding trials remain the gold standard for determining energy content. Worked example with modified Atwater: a kibble at 24% protein / 12% fat / 45% NFE gives ME = (24×3.5 + 12×8.5 + 45×3.5) = 343.5 kcal/100 g ≈ 3.4 kcal/g.\n","sources":["generated from .md only"],"tokens_estimated":154,"generated_at":"2026-07-16","tip":"Use /api/v1/topics to discover more topics. /api/v1/nutrient for precise single-point queries. /api/v1/cross_compare for 2-3 standard comparisons."}