Enzyme-DFM F combinations improve broilerperformance under cyclic heat stress and , necrotic enteritischallenge

摘要

Exogenous enzymes have been attributed a number of gut health related benefits. Xylanases have been shown to have prebiotic effects in different species including poultry and this effect is attributed to the production of xylo-oligosaccharides and arabinoxylo-oligosaccharides mainly in the hind gut of the birds fed diets supplemented with xylanase. These oligo-xylomers have the so-called prebiotic effect which selectively stimulate the beneficial bacteria and produce short chain fatty acids. A protease, on the other hand, may have a direct influence on enteric disease. Increased undigested protein appears to be a predisposing factor for dysbacteriosis, in particular related to necrotic enteritis (NE). It appears that proteases by increasingthe digestion and absorption of protein in the higher portion of the digestive tract reduce the supply of substrates to the potential pathogens in the lower gut thus preventing dysbacteriosis.