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Table 1 Prediction equations of energy values of pig feeds based on their chemical composition [19]

From: Alternative prediction methods of protein and energy evaluation of pig feeds

Equationsa R 2
DE = 4477 – 10.0 × Ash + 3.8 × EE - 7.1 × CF 0.82
DE = 4443 – 6.9 × Ash + 3.9 ×EE – 4.0 × NDF 0.88
DE = 4151 – 12.2 × Ash + 2.3 × CP + 3.8 × EE – 6.4 × CF 0.89
DE = 4168 – 9.1 × Ash + 1.9 × CP + 3.9 × EE – 3.6 × NDF 0.92
DE = 1407 + 0.657 × GE – 9.0 × Ash + 1.4 × CP – 6.7 × CF 0.86
DE = 1161 + 0.749 × GE – 4.3 × Ash – 4.1 × NDF 0.91
DE = 949 + 0.789 × GE – 3.5 × Ash – 3.8 × NDF – 5.4 × ADL 0.92
DE = 1007 + 0.750 × GE – 4.6 × Ash + 0.8 × CP – 3.6 × NDF – 5.0 × ADL 0.93
ME = 4369 – 10.9 × Ash + 4.1 × EE - 6.5 × CF 0.87
ME = 4334 – 8.1 × Ash + 4.1 × EE -3.7 × NDF 0.91
ME = 4168 – 12.3 × Ash + 1.4 × CP + 4.1 × EE - 6.1 × CF 0.88
ME = 4194 – 9.2 × Ash + 1.0 × CP + 4.1 × EE – 3.5 × NDF 0.92
ME = 1255 + 0.712 × GE – 8.5 × Ash – 6.6 × CF 0.85
ME = 1099 + 0.740 × GE - 5.5 × Ash – 3.7 × NDF 0.91
  1. a DE Digestible energy, ME Metabolizable energy, EE Ether extract, CF Crude fiber, CP Crude protein, GE Gross energy, NDF Neutral detergent fiber, ADF Acid detergent fiber, ADL Acid detergent lignin, energy values and chemical composition expressed in kcal per kg of DM and g per kg of DM, respectively
  2. R 2 – coefficient of determination