AME kcal/kg = 35.3 × CP% + 79.5 × EE% + 40.6 × NFE% + 199, whereas:CP% = Crude protein content as a percentage in feedstuff, EE% = ether extract content as a percentage in feedstuff, NFE% = nitrogen free extract content as a percentage in feedstuff. The equation was cited as reference by Carpenter and Clegg (1956), but not reported in the MS text:
Carpenter, K.J., Clegg, K.M., 1956. The metabolizable energy of poultry feeding stuffs in relation to their chemical composition. J. Sci. Food Agric. 7:45-51.
Article Evaluating Poultry Feedstuffs in Terms of Their Metabolizabl...