Influence of enzymes on performance and digestive parameters of broilers fed rye-based diets

Abstract

An experiment was conducted to study the influence of enzyme supplementation (ES) to rye-based diets on rate of food passage through the digestive tract, viscosity of jejunum content, volatile fatty acid concentration in ceca, and performance of broilers. There were seven treatments; six diets arranged factorially with three varieties of rye (Petkus, Prima, and Saratov V) and two levels of ES (0 or 500 ppm of an enzyme complex containing 858 IU of beta-glucanase and 864 IU of xylanase/g) and an additional control diet based on corn. Each treatment was replicated seven times (12 chicks caged together), and the trial lasted 25 d. Rye feeding increased intestinal viscosity and impaired bird performance at 25 d (P < 0.001). Among rye diets the greatest feed intake and weight gain were obtained with Petkus variety, which also produced the lowest intestinal viscosity. Enzyme addition reduced the time needed to recover 1% (0.78 vs. 0.98 h; P < 0.05) and 50% (4.2 vs. 6.5 h; P < 0.01) of the marker in feces and reduced the mean retention time of marker in the gastrointestinal tract (17.1 vs. 18.8 h; P < 0.05). Also, ES reduced intestinal viscosity (P < 0.001) and improved feed intake, daily gain, and feed conversion of birds from 4 to 25 d (P < 0.01) but did not modify volatile fatty acid concentration in ceca. We concluded that ES added to rye diets decreased intestinal viscosity and accelerated digestive transit, improving productive performance of broilers.

Gastrointestinal responses of turkeys to the addition of exogenous xylanase and glucanase to diets

“…In the experiment of Józefiak et al (2004), the increase in SCFA concentration was more distinct: almost two times higher in broilers fed barley-or oat-diets supplemented with xylanase and protease. In other studies, enzymatic preparations added to rye diets did not increase the SCFA concentration in caecal digesta (Lázaro et al, 2003).…”

“…which plays an important role in the formation of viscosity in ileal digesta (Lázaro et al, 2003). The addition of exogenous enzymes increased the concentration of SCFA, mainly of acetic acid, in caecal digesta.…”

Efficacy and Metabolizable Energy Equivalence of an α-Amylase-β-Glucanase Complex for Broilers

“…It has been demonstrated that dietary supplementation of xylanase and glucanase improves the performance and nutrient digestibility of broilers fed diets containing high levels of grains rich in non-starch polysaccharides (NSP) , which have been frequently related to a decrease in intestinal viscosity (Petterson et al, 1991;Lázaro et al, 2003). However, total NSP content in corn and soy are low compared to wheat and barley, for instance (Willamil et al, 2012), and therefore, diets having large proportions of corn are not expected to present important viscosity-related problems.…”

Sustitución de la harina de soja con mezcla hojas de yuca:harina de sangre, en dietas de pollos con o sin sumplementación de enzimas

“…According to Lazaro et al (2003), enzyme supplementation reduced the viscosity of the jejunum content and accelerates the rate of passage of digesta through gastrointestinal tracts of birds thus reducing the digestive transit time of broilers.…”