Metabolizable energy values of diets supplemented with xylanase determined with laying hens

Abstract

-The objective of this study was to evaluate the effect of the supplementation of xylanase in diets with reduced energy level on the apparent metabolizable energy corrected for nitrogen, determined with laying hens at 14, 36, 60 and 80 weeks of age. Four digestibility trials were conducted, using 80 Hy-line W36 laying hens aged 14, 36, 60 and 80 weeks of age. Birds were distributed in a completely randomized design in 2 × 2 factorial arrangement (energy level × inclusion of xylanase), totaling four treatments with 10 replicates of two birds each. Treatments were: positive control (balanced diet for their age); positive control + xylanase; negative control (diet with reduction of 100 kcal/kg in the level of metabolizable energy); and negative control + xylanase. Xylanase, produced by microorganism Trichoderma reesei, was added to the diets at 100 g/t (16,000 BXU/kg) for diets fed at 14 weeks and 75 g/t for diets of 36, 60 and 80 weeks (12,000 BXU/kg). The data obtained were subjected to analysis of variance at 5% probability. Supplementation of xylanase promoted higher values for AME (apparent metabolizable energy) and AME n (apparent metabolizable energy corrected for nitrogen) determined with 80-week-old laying hens, subjected to diet with energy level according to the nutritional requirements for their age. Supplementation of xylanase increases the matabolizability coefficient of the dietary crude protein and improves the nitrogen retention of laying hens at 14 weeks. In addition, xylanase associated with adequate levels of dietary energy promotes higher values for AME and AME n determined with laying hens at 80 weeks of age.

Xylanases in diets with alternative feeds and energy reduction in commercial layers

“…The literature shows the possibility of energy reduction of up to 200 kcal/kg of ME in the diet containing XP, which is higher than the absolute majority of reductions observed in the studies: up to 100 kcal of ME/kg (Souza et al, 2012), 120 (Iwahashi et al, 2011), 125 (Cowieson, 2010), 145 (Viana et al, 2011), and 154 kcal of ME/kg (Bobeck et al, 2014).…”

“…The increase in the metabolizability of PC is related to the reduction in the production of endogenous amino acids, demonstrating that xylanases are efficient in reducing this production through a secondary effect, in which they improve the use of the protein content resulting from diets, there by improving digestion processes and directly affecting the metabolizability of nutrients (Masey O'Neill et al, 2014). Therefore, supplementation with XC was effective in improving the metabolizability of proteins, and consequently, their absorption due to the action of anti-nutritional factors (Souza et al, 2012).…”

Effects of the Dietary Inclusion of Xylanase on the Performance and Jejunum Morphometry of Meat-Type Quails

“…Evaluating four xylanase inclusion levels (0, 200, 400 and 600 g/ton), Schoulten et al (2003) found that xylanase, at an adequate dose, is effective in reducing the negative effects caused by NSPs present in highly-viscous diets. Xylanase also has positive effects on low viscosity diets (Iwahashi et al, 2011;Souza et al, 2012;Khoramabadi et al, 2014).…”

“…Although xylanases are typically used in viscous grain diets (Mathlouthi et al, 2002;Schoulten et al, 2003;Tekeli et al, 2014), studies have also investigated its use with non-viscous or low viscosity grains (Iwahashi et al, 2011;Barbosa et al, 2012;Souza et al, 2012;Khoramabadi et al, 2014).In general, the inclusion of exogenous enzymes in poultry diets promotes a more efficient digestion, reducing maintenance energy requirements, as well as the amount of substrate that reaches the large intestine by improving substrate utilization in the small intestine, thereby altering the microbial population in the terminal ileum (Bedford & Apajalahti, 2001).…”

Enzymatic association in the diets of laying hens raised in an alternative cage-free system

“…Xylanase is mainly responsible for the hydrolysis of xylan, the main constituent of plant cell wall hemicellulose, increasing digestive motility and reducing energy expenditure in digestion and absorption (Cowieson et al, 2010). According to Souza et al (2012), xylanase supplementation in laying hen diets resulted in an increase in apparent metabolizable energy (AME) and, consequently, improved the productive performance of the birds.…”