Akademik Veri Yönetim Sistemi
ITALIAN JOURNAL OF ANIMAL SCIENCE, cilt.23, sa.1, ss.15-25, 2024 (SCI-Expanded)
Effects of two different dietary xylanases on broiler performance and gut integrity were determined.
Totally, 7600-d-old Ross-308 chicks were used for 41 d. Chicks were randomly assigned to
4 dietary treatments with 10 replicates (95 males, 95 females per replicate); they were: positive
control (PC) based on Ross 308 nutrient specification; negative control (NC) with less ME (80 kcal/
kg), crude protein and amino acids compared to PC; NCþAO with addition of xylanase derived
from Aspergillus oryzae (AO); NCþTB with addition of xylanase derived from Trichoderma bisset
(TB). Birds fed on PC diet significantly (p < 0.05) had higher final body weight (BW) and body
weight gain (BWG) compared to other treatments. The final BWG and feed conversion ratio (FCR)
were not fully compensated with the addition of the enzymes compared to PC, and FCR was
found significantly (p<0.05) higher in birds fed on diets NCþAO and NCþTB. However, dietary
xylanase significantly improved FCR, villus surface area and total goblet cell number in NCþAO
and NCþTB birds compared to NC. Xylanase supplementation significantly increased the concentrations
of branched-chain fatty acid (BCFA) and total caecal short-chain fatty acid (SCFA)
(p<0.05). Furthermore, both xylanases increased lactobacillus count (p<0.05). Dietary treatments
had no effect on carcase parameters and mortality rate. In conclusion, along with improving performance
parameters, the inclusion of xylanase enzymes with nutrient matrix value in broilers’
diet may ameliorate intestinal morphology, stimulate caecal microflora and increase caecal SCFA
concentrations, but nutrient contribution of both enzymes seems overestimated.