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The effect of enzymatically-modified canola meal on growth performance, nutrient utilization and intestinal bacterial population of broiler chickens

2021 CPRF
Canola meal (CM) is a valuable source of protein for poultry, despite containing substantial amounts of dietary fiber components, including non-starch polysaccharides (NSP). Supplementation of poultry diets containing CM with enzymes is an effective mean to improve its nutritive value, because enzymatic hydrolysis of NSP not only improves their digestibility but also contributes to the production of prebiotic-type NSP hydrolysis products. In our earlier research, the optimal composition of ingredient-specific carbohydrase to target the NSP of CM was determined in vitro. The most effective blend containing pectinase, xylanase, and invertase activities lead to depolymerization of 47.9% of NSP with the production of bioactive NSP-hydrolysis products and was used to produce enzymatically modified CM (ECM). Compared with CM, ECM contained less NSP, NDF, total dietary fiber, sucrose, oligosaccharides, and phytate P. Moreover, Lactobacillus spp. were highly abundant in ECM when compare to CM (~300 fold increase), suggesting that ECM might offer not only the prebiotic benefits to animals but may also serve as a source of probiotic organisms. The objective of this study was to evaluate the effects of replacement of CM with ECM on growth performance, nutrient utilization and intestinal bacterial population in broilers. Four-day-old Ross 308 broiler chickens were assigned to 3 dietary treatments, each consisting of 8 pens of 8 birds each, and were raised under controlled environment for 21 days. Birds were fed the starter (4-14d) and grower (14-21d) Control diets containing 10% and 20% of CM, respectively, and the experimental diets, where ECM replaced 5% for starter and grower diets, or entire 10% of CM for the starter and 20% of CM for the grower diets. The trial was set up as completely randomized design with pen as an unit. All the statistical analysis was conducted by the SAS program (version 9.4, SAS Institute Inc., Cary, NC). Means were separated by Tukey’s honestly significant difference. All statements of significance were based on P<0.05. Replacing CM with ECM did not affect growth performance, but it significantly increased overall total tract digestibility of NSP and dietary AMEn, and decreased sialic acids secretion during the grower period. Lactobacillus spp. were present in much larger counts (P < 0.01) in ileal and cecal digesta of birds fed the ECM diets. The abundance of E. coli was significantly lower in the cecal digesta of the high ECM diets compared to the Control. Modification of CM with enzymes significantly changed the composition and structure of CM fiber. Replacing CM with ECM can improve nutrient digestibility and increase the presence of probiotic organisms in poultry. Therefore, enzymatically-enhanced CM can improve gut health and could support the antibiotic-free feeding programs in broiler chickens.
Tags :
enzymatically-modified canola meal,growth performance,gut microbiome
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PhD Candidate

University of Manitoba

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