Effects of dietary supplementation of multi-enzyme complex on the energy utilization in rooster and performance of broiler chicks

Two experiments were conducted to determine the effects of dietary supplementation of REAP® enzyme into corn-soybean diet on the energy utilization in poultry and performance of broiler chicks. In the first experiment, a total of 16 50 weeks adult roosters (ISA-Brown) were divided into 4 groups with 4 birds per replicate and the experimental diets contained the two levels of energy (2650 and 2759 kcal TMEn/kg diet) with 0 or 0.1% REAP® and were subjected to assay of apparent metabolizable energy (AME). In the second experiment, 360 3 days old male broiler chicks (Ross) were divided into 4 groups with 3 replicates of 30 birds per replicate and were assigned at random to one of the four experimental diets containing the two levels of energy (3100 and 2980 kcal TMEn/kg diet) with 0 or 0.1% REAP®. AME value of the high energy groups were significantly higher (p < 0.05) than that of the low energy groups when measured at 28 days. The body weight gain of the birds fed the low energy diet with 0% REAP was lower significantly than those of the other groups (p < 0.05). There were no significant differences in feed intake and feed conversion rate among the treatments. The breast muscle weights of the low energy diet birds were higher than those of the high ones and those of the lower energy group with 0.1% REAP were the highest (p < 0.05). The relative abdominal fat weight was reduced by the dietary REAP (p < 0.05). Percentage duodenum weights of high energy group were higher than those of the low energy group. The intestinal lengths (cm/100 g BW) of low energy diet group without REAP were lower than those of the others (P < 0.05). The results demonstrated that, dietary REAP improved body weight gain and reduced abdominal fats. Therefore, it can be concluded that, dietary supplementation of REAP improves nutritive value of corn-soybean diet in the broiler chicks.Key words: REAP®, broiler chicks, corn-soybean, apparent metabolizable energy (AME)