Interaction between xylanase and phytase on the digestibility of corn and a corn/soy diet for broiler chickens

Abstract

An experiment was carried out to evaluate the digestibility and metabolizability of corn and a corn/soy-based diet with the inclusion or not of xylanase and/or phytase in broilers. In the trial, 1,120 broiler chicks were distributed according to a completely randomized experimental design, consisting of 16 treatments, with 10 replicates of 7 birds each. Treatments were evaluated following a factorial arrangement (4 × 2 × 2), with 4 xylanase levels (zero, 50, 100, or 150 fungal β-xylanase units/kg; FXU), 2 phytase levels (zero or 1,000 phytase units/kg; FTU), and 2 diets (corn/soy or pure corn). The same basal diets were fed from one to 14 d post hatch for all birds, after which the experimental diets were provided until d 25. All birds were euthanized on d 25 for collection of ileal contents. Samples of feed, excreta, and ileal digesta were analyzed for determination of apparent ileal digestibility. The effect of xylanase on the coefficient of apparent dry matter metabolizability and apparent metabolizable energy was increased by the presence of phytase in the complete diet but not in the diet based on pure corn resulting in a diet*phytase*xylanase interaction (P < 0.01; P < 0.001, respectivaly). Equivalent effects were observed for the apparent coefficient of ileal protein digestibility in which xylanase effects were potentiated by the presence of phytase only in the complete diet, resulting in a significant 3-way interaction. In corn there was a limitation in improving digestibility when we added increasing levels of xylanase with phytase. Otherwise in the corn/soy-based diets, the enzymes were potencialized when they were added together. The fact that the effect of xylanase was enhanced by the presence of phytase in complete diets but not in pure corn may be associated with differences in substrate (arabinoxylan and/or phytate) concentration and presentation, diet nutrient balance, or other factors. It can be concluded that the interactive effects of xylanase and phytase can be substantial but may depend on the characteristics of the diet fed.

Effects of a combination of phytase and multi-carbohydrase enzymes in low-density corn–soybean meal based diets on growth performance and ileal nutrients digestibility of male broilers

“…Juanpere et al (2005) indicated that on top supplementation of multi-carbohydrase increases nutrients digestibility when added to barley-SBM diets containing phytase, although they have not observed more beneficial outcomes when multi-carbohydrase supplemented to phytase containing C-SBM diets. However, the current results are in contrast with the findings of Schramm et al (2017) who reported that total tract digestibility of DM and energy and ileal digestibility of CP increased by on top supplementation of multi-carbohydrase to C-SBM diets containing phytase. Kocher et al (2003) observed that the combined addition of pectinase, protease, and amylase increased AMEn when added to C-SBM diets with reduced energy and protein density.…”

Hybrid Phytase and Carbohydrases in Corn and Soybean Meal-Based Diets for Broiler Chickens: Performance and Production Costs

“…However, these products contain considerable amounts of NSPs, such that using carbohydrases may have a positive impact on animal performance. Schramm et al (2017) affirmed that the presence of phytase, in a complete corn/soy-based diet, has a potentiating effect for exogenous xylanase. In our study, the performance results were improved in broilers fed diets containing nutritional reductions and enzymatic supplementation with carboydrases, showed the action of this enzyme.…”

Performance and physiological parameters in broilers fed different enzyme complexes

“…Toledo et al (2007) support this result in a study that evaluated the enzyme complex supplementation of broiler diets up to 35 days of age, verifying that birds require higher metabolizable energy due to lower digestive capacity. Similarly, Yang et al (2010) and Schramm et al (2016) attributed the inefficacy of exogenous enzymes to nutritional imbalance, which inhibits the activity of enzymes that improve nutrient degradation, digestion, and absorption.…”

“…However, the existing knowledge about the role of enzymes is limited, controversial, or inconsistent, demonstrating that information is still needed in this area of research (OLUKOSI et al, 2007;JIANG et al, 2008;CARDOSO et al, 2011;AMERAH et al, 2016;SCHRAMM et al, 2016).…”