prediction the metabolizable energy of most wheat cultivars of alborz province with a multiple regression equation

this study was conducted to determine regression equations for the prediction metabolizable energy value corrected for zero nitrogen retention (amen) in 12 wheat cultivars (mahdavi, chamran, sabalan, sepahan, sivand, alamoot, sholeh, neishaboor, pishtaz, bahar, shiraz and shahpasand) cultured in alborz province of iran. chromic oxide marker bioassay was used to determine wheat cultivars nitrogen-corrected ame (amen) content for adult roosters. the experimental diets were composed of 40% of test sample and the remaining 60% was a combination of other ingredients held constant across diets. amen value of the test samples were calculated and related to their chemical composition by regression analysis with spss software. the result of multiple regression equations was shown that cf and starch are the best factors for prediction of amen. the equation for prediction of amen based on chemical composition was:  amen wheat (kcal/kg of dm) = 69 sta - 1028 cf.