Enzyme supplementation of low or high crude protein concentration diets for broiler chickens

Abstract

Previous investigations have established that supplementing broiler chicken diets with appropriate endosperm cell wall degrading enzymes can improve nutrient digestion, and indicated that this could allow lower protein diets to be used. In this study the effect of enzyme supplementation on the productive value of low (192 g/kg dry matter (DM)) and high (227 g/kg DM) protein diets was studied. The diets employed were based on barley, wheat and rye, and the two enzyme preparations used, Glucanase GP 5000® and Novozym-343®, contained (3-glucanase and arabinoxylanase activities.The high protein diet gave a higher incidence of sticky droppings, but resulted in a higher growth rate and improved food conversion ratio than the low protein diet. Enzyme supplementation reduced the incidence of sticky droppings and also improved growth rate, food intake and food conversion efficiency for both diets, with the Glucanase GP 5000 preparation generally being more effective. Enzyme supplementation improved growth rate on the low protein diet to a level equal to or better than that on the high protein diet, although this was achieved by a better food intake and an inferior food conversion ratio. This study demonstrated that supplementation with appropriate enzymes could allow a reduction in dietary protein level without affecting broiler growth rate.

Growth and Intestinal Morphology of Male Turkeys as Influenced by Dietary Supplementation of Amylase and Xylanase

“…The growth performance for birds supplemented with xylanase suggests that the level of inclusion used within this study was not beneficial. Pettersson et al (1990) observed similar lack of growth response associated with xylanase supplements fed to broiler chickens. Bedford et al (1992) reported that xylanase supplementation did not improve the rate of gain, feed intake, or starch and protein digestibility in swine.…”

Effects of cultivar, pelleting and enzyme addition on nutritive value of barley in poultry diets

“…Enzyme supplementation greatly reduced this problem, probably attributable to the reduction of intestinal fluid viscosity (White et al, 1981) and more effective absorption of nutrients from the small intestine (Hesselman and Aman, 1986;Pettersson and Aman, 1989). Other workers have noted a considerable reduction in sticky droppings with j8-glucanase addition (Rotter et al, 19896;Pettersson et al, 1990;Brufau et al, 1991). With the wheat diet enzyme addition improved food efficiency and reduced food intake, probably because of its pentosanase activity, but had no effect on the already low percentage of sticky droppings.…”

β-Xylosidases from filamentous fungi: an overview

“…The use of exogenous enzymes to reduce the feed cost represents, undoubtedly, a more versatile alternative to improve the rentability of this sector. The addition of exogenous enzymes, including b-xylosidases to diets has significant potential to improve nutritive values of feed and animal performance (Pettersson et al 1990;Beauchemin et al 2003;Omogbenigun et al 2004). Xylanolytic enzymes are capable to hydrolyze the hemicellulose present in wheat, corn and other cereals, promoting the nutrient digestibility and reducing the manure, nitrogen and phosphorus excretion.…”