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Table 5 Prediction equations of metabolizable energy for pigs from values determined for cockerels [50]

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

No.a Equationb n R 2
1 MEPIG = 4.170 + 0.7405 × MECOCKERELS 84 0.697
2 MEPIG = 4.826 + 0.7016 × MECOCKERELS – 0.002464 × CF 84 0.699
3 MEPIG = 4.966 + 0.6924 × MECOCKERELS 80 0.775
4 MEPIG = 9.392 + 0.4292 × MECOCKERELS – 0.01535 × CF 80 0.858
5 MEPIG = 3.312 + 0.7924 × MECOCKERELS 51 0.885
6 MEPIG = 6.686 + 0.5960 × MECOCKERELS – 0.01190 × CF 51 0.923
7 MEPIG = 4.700 + 0.7634 × MECOCKERELS 29 0.710
8 MEPIG = 9.891 + 0.4274 × MECOCEKRELS – 0.01612 × CF 29 0.833
  1. aEquations: No. 1 and 2 - estimated for 84 samples (70 feedstuffs and 14 mixed diets); No. 3 and 4 - estimated after exclusion four samples of meat and bone meals; No. 5 and 6 - estimated for cereals and their by-products, vegetable proteins and mixed diets; No. 7 and 8 - estimated for animal protein and miscellaneous
  2. bMEPIG and MECOCKERELS: Metabolizable energy determined for pigs and cockerels, respectively, expressed in MJ per kg dry matter; CF: Content of crude fiber expressed in g per kg dry matter
  3. R 2 – coefficient of determination