Lordelo, Maria Madalena dos SantosMendes, Ana Rita Almeida2015-05-042015-05-042015Mendes, A.R.A. - Suplementação com xilanase de regimes alimentares à base de milho e soja para frangos de carne. Lisboa: ISA, 2015, 78 p.http://hdl.handle.net/10400.5/8512Mestrado em Engenharia Zootécnica - Produção Animal - Instituto Superior de Agronomia / Faculdade de Medicina VeterináriaMaize and soya, feeds considerer of low viscosity and high quality, contain some non-starch polysaccharides and these may slightly raise the digesta’s viscosity and decrease broiler performance. Enzyme supplementation may attenuate these effects. In the present study four treatments were used (AE – High Energy; AEX – High Energy + Enzyme; BE – Low Energy; BEX – Low Energy + Enzyme) in maize-soya diets with 3040 kcal and 2941 kcal of metabolizable energy per kg of feed, to evaluate the effect of the use of a commercial xylanase. Mortality, amount of feed ingestion, body weight, average body weight gain and dimensions of the digestive tract organs were registered. An improvement in body weight and in body weight gain was observed for the animals of the BEX treatment. There was a decrease in the feed conversion ratio for the animals of the BEX treatment when compared to the animals of the BE treatment. Results indicate that this enzyme may have a positive effect in broilers fed maize-soya diets, mainly in low energy treatments.porbroilersmaizesoyanon-starch polysaccharidesenzyme supplementationxylanasemaster thesis201845377