Pasquali, Guilherme A.M. [UNESP]Dos Santos, Tatiane S. [UNESP]Zanetti, Leonardo H. [UNESP]Dornelas, Livia C. [UNESP]Cruvinel, Jéssica M. [UNESP]Muro, Everton M. [UNESP]Araujo, Robert G.A.C. [UNESP]Netto, Raimundo G.F. [UNESP]Denadai, Juliana C. [UNESP]Pezzato, Antonio C. [UNESP]Sartori, José R. [UNESP]2022-04-292022-04-292021-01-01Canadian Journal of Animal Science, v. 102, n. 1, p. 9-18, 2021.1918-18250008-3984http://hdl.handle.net/11449/230504A study was conducted to evaluate the effects of including a xylanase + β-glucanase enzyme product in corn–soy-based diets on performance, caecal short-chain fatty acids and thermal profile, ileal digestibility, and intestinal kinetics of broiler chickens. A total of 744 male day-old chicks were randomly allotted to 24 floor pens and distributed in a 2 × 2 factorial arrangement with low or standard energy level × without or with 100 g of the enzyme per ton of feed. Enzyme supplementation improved bodyweight gain from 1 to 21 d (P < 0.05). An increased caecal concentration of acetic acid was observed when the enzyme was added to the low-energy diet (P < 0.05). The pH of the caecal content was reduced (P < 0.01), and the caecal temperature was increased by low-energy diets (P < 0.05). The apparent ileal digestibility of energy was improved by the enzyme (P < 0.01). The addition of the enzyme increased the mean retention time in the distal ileum (P < 0.05). In summary, the addition of a xylanase + β-glucanase enzyme product in corn-based diets increases the retention time of digesta in the distal ileum and the caecal acetic acid concentration, improves ileal digestibility of energy and performance from 1 to 21 d in broiler chickens fed corn–soy-based diets.9-18engCarbohydraseNSP enzymesThermographyArtigo10.1139/cjas-2021-00322-s2.0-85125713042