Determination of standardized ileal digestible amino acids prediction equations of poultry by-products meal in broiler chicken

This experiment was conducted to determine the prediction equations of standardized ileal digestible amino acids) SID (contents of poultry by-products meal (PBM) based on its chemical compositions. A total of 270 one-day-old Ross 308 male broiler chicks in nine dietary treatments (five replicates/six birds) were used. The treatments were included eight semi-purified diets containing each of PBM as the only source of dietary protein and one nitrogen free diet in order to determine SID amino acids. On day 28, the birds were euthanized to collecting ileal digesta for further analyses of acid insoluble ash and amino acids.  The SID contents of Met and Lys was varied from 0.52 to 0.89% and 1.88 to 2.46%, respectively (P< 0.05). Finally, according to adjusted coefficient of determination and standard error of prediction the best prediction equations were selected to predict 10 SID amino acids of PBM. For example, the prediction equations of Lys, Met, Met + Cys and Thr was recommended as:dLys = 0.937 + 0.022 × CP - 0.057 × Ash (SEP 0.033; Adjusted R2 0.966)dMet = 0.0550 + 0.009 × CP (SEP 0.550; Adjusted R2 0.806)dMet + dCys = 0.250 × CP (SEP 0.114; Adjusted R2 0.994)dThr = 0.023 × CP + 0/015 × EE (SEP 0.085; Adjusted R2 0.997)