The effect of novel xylanase on feeding value of diet containing cereal by-products for broilers

Abstract

Abstract. Effects of exogenous xylanase on N-corrected dietary apparent metabolisable energy (AMEn), coefficients of dry matter (DMR) and nitrogen retention (NR), fat digestibility (FD), and gastrointestinal tract (GIT) development were examined. Birds’ growth performance was also measured. Birds were fed one of two mash diets. A control diet was prepared that had major ingredients of 404.2 g/kg wheat and a mixture of important home produced cereal by-products (including 145.0 g/kg wheat DDGS, 90.0 g/kg oat feed, 60.3 g/kg wheat feed), and contained 213 g/kg CP and 12.64 MJ/kg metabolisable energy. Each diet was fed to sixteen pens with two Ross 308 male broilers following randomisation. Xylanase supplemented diet had higher (P0.05) in growth performance, although feeding xylanase decreased (P<0.05) the weights of the total GIT of the birds. It can be concluded that supplementary xylanase gave a small improvement (3.5% increase in AMEn) in the feeding value of the cereal by-product diet but this did not result in an improvement in growth performance.

Keywords

• cereal by-products
• chickens
• xylanase
• metabolisable energy