Growth Performance and Carcass Traits of Broiler Chickens Fed Rice Offal-based Diets Supplemented With Xylanase and Glucanase

This study evaluated the effects of xylanase and glucanase supplementation on growth performance and carcass traits of broiler chickens fed rice offal (RO)-based diets. A total of 180 unsexed day-old broiler chicks were randomly allocated to four dietary treatments in a completely randomized design, with three replicates of 15 birds each. The control diet contained no RO or enzyme supplementation, while the other treatments contained 5%, 10%, or 15% RO, each supplemented with a 50:50 combination of xylanase and glucanase at manufacturer-recommended levels. Growth performance was assessed during the starter (0–4 weeks) and finisher (5–8 weeks) phases, while carcass characteristics were determined at the end of the finisher phase. Results showed that during the starter phase, birds on 10RO and 15RO diets had significantly higher (p < 0.05) average daily weight gain (32.21 g and 32.46 g, respectively) compared to the control, while feed conversion ratio (FCR) was lowest in the 5RO group (1.43). In the finisher phase, birds on the 10RO diet recorded the highest (p < 0.05) weight gain (34.75 g), feed intake (119.74 g), and FCR (3.50). Carcass traits at the finisher phase indicated that 10RO produced the highest (p < 0.05) live weight (1,555.90 g) and dressed weight (1,083.30 g), whereas 15RO yielded the highest dressing percentage (72.20%). The study concludes that inclusion of up to 10% RO with xylanase and glucanase supplementation optimizes growth and carcass yield in broiler chickens.