Knowledge of the metabolizable energy of any feedstuff is key to efficiently using them in feed formulations for any livestock species. This experiment was conducted to determine the metabolizable energy of novel sweetpotato-bran energy concentrates in roosters by the regression method as a first step towards optimizing the use of these concentrates in poultry feeding. Three sweet potato-bran blends; sweet potato and corn bran, SP-CB (3:2), sweet potato and rice bran, SP-RB (3:2), and sweet potato and wheat bran, SP-WB (7:3) were extruded at 100oC in a single screw extruder. Nine experimental diets were then created by incorporating extrudates in a reference diet (21.2%CP, 2845 kcal/kg ME, 0.95% calcium, 0.35% available phosphorus, 0.43% methionine, and 1.01% lysine) at 0, 5, 10, and 15% in replacement for glucose monohydrate (C6H12O6·H2O), and titanium dioxide was incorporated in the complete diets at 0.5% as indigestible marker.Forty 30-week-old ISA brown roosters were placed in metabolic cages (2 roosters per cage)and fed one of the 10 diets (reference diet + nine experimental diets) for a 7-day adaptation period and 3-day excreta collection. Diets and excreta were analyzed for dry matter, Kjeldahl nitrogen, titanium, and gross energy. The metabolizable energy value of energy concentrates; SP-CB, SP-RB, and SP-WB were estimated as the slope of the linear relationship between the inclusion rate of extruded sweet potato-bran blends and the glucose-corrected AMEn value of the experimental diets and revealed metabolizable energy values of 3.01 kcal/g, 3.11 kcal/g, and 3.16 kcal/g, respectively, being 68.6%, 72.7%, and 74.2% of their analyzed gross energy values.
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