Efficacy of β-mannanase on broiler growth performance and energy utilization in the presence of increasing dietary galactomannan

Abstract

An experiment was conducted to investigate the impact of β-mannanase inclusion on growth performance, viscosity, and energy utilization in broilers fed diets varying in galactomannan (GM) concentrations. Treatments were arranged as a 3 (GM concentration) × 3 (β-mannanase inclusion) factorial randomized complete block design with 12 replicates of 29 male broilers per replicate for a 42-d experiment. Efforts were made to reduce the amount of soybean meal, and thus GM, in the basal diet with guar gum included at 0, 0.21, or 0.42% to achieve a GM supplementation of 1,500 and 3,000 ppm, respectively. Beta-mannanase was included at 0, 200, or 400 g/ton. Broilers were fed a starter (d 0 to 14), grower (d 15 to 28), and finisher diets (d 29 to 42). Growth performance was monitored and ileal contents collected on d 14, 28, and 42 to determine ileal digestible energy (IDE) and intestinal viscosity. Increasing levels of GM negatively (P < 0.05) influenced body weight (BW) following the starter and grower periods and increased (P < 0.01) mortality corrected feed conversion ratio (FCR) throughout the study. Reduced growth performance was associated with increased (P < 0.05) intestinal viscosity and decreased (P < 0.05) IDE when GM inclusion was increased. Inclusion of β-mannanase in diets containing supplemental GM on d 28, increased average BW to levels similar to diets without supplemental GM. Improvements in FCR were also observed with β-mannanase inclusion in diets containing supplemental GM. Ileal digestible energy was increased (P < 0.05) with the addition of β-mannanase on d 28 of age. Multiple interactions in growth performance, intestinal viscosity, and IDE were associated with β-mannanase administration. In conclusion, β-mannanase improved IDE, reduced intestinal viscosity, and improved growth performance; however, the observed benefit was dependent upon dietary GM concentration.

A dose–response study to evaluate the effects of pH-stable β-mannanase derived from Trichoderma citrinoviride on growth performance, nutrient retention, and intestine morphology in broiler chickens

“…The observation by Ryu et al (2017) in laying hens indicated that b-mannanase increased mannose digestibility either in high mannan or in low mannan diets. Similarly, Latham et al (2018) reported that the supplementation of b-mannanase to the male broiler chickens ration led to an increase in ileal digestible energy regardless of the mannan levels in the diet. Our results concur with data reported by Cowieson and Ravindran (2008), who observed an increase in energy utilisation and permeability of cell wall in a corn-based diet when targeting NSP bonds by the addition of exogenous enzymes in to the broiler chickens diet.…”

Manno‐oligosaccharide preparation by the hydrolysis of konjac flour with a thermostable endo‐mannanase from Talaromyces cellulolyticus

“…Endo-1,4-b-mannanase (EC 3.2.1.78) could randomly cleave b-1,4-glycosidic bonds in polymannose fibres to environmentally friendly, energy-saving and state-of-theart method for MOSs preparation. Moreover, mannanase, with its capacity to hydrolyse mannan-type polysaccharides, could be widely used in many fields, such as food and feed processing, paper making, textile printing, oil drilling and biological bleaching, in which the mannantype polysaccharides need to be removed or degraded (Dhawan and Kaur 2007;Chauhan et al 2012;Latham et al 2018).…”

Effect of Using Different Guar Meal Levels and Β– Mannanase Supplementation on Productive Performance of Golden Montazah Laying Hens

“…Beta-mannanase supplementation overcame harm effects of guar meal (Mohayayee and Karimi, 2012), possesses ability to hydrolyze galactomannan, reduce intestinal viscosity (Lee et al, 2003a), enhance growth, and improve feed conversion (Gharaei et al 2012). Benefit of βmannanase dependent on concentration of guar meal in diet (Latham et al 2017). The aim of this study was to evaluate the effect of using different guar meal levels with or without β-mannanase supplementation to layer diets on productive performance, egg quality and organs weight percent of Golden Montazah layers.…”