title: Bioefficacy of enzyme preparations containing beta-glucanase and xylanase activities in broiler diets based on barley or wheat, in combination with flavomycin.
abstract: The objective of the study was to determine the effects of two enzyme preparations containing beta-glucanase and xylanase activities on barley- and wheat-based diets, respectively, for broilers, in combination with flavomycin. In addition, the stability of the enzyme preparations after pelleting was measured. Temperatures recorded during the pelleting process reached 75 to 80 C, and the activities recovered with respect to the amounts present in the mash feed before pelleting were 80% or higher. Two performance experiments were conducted simultaneously under the same conditions over 6 wk. In addition, intestinal viscosity and incidence of vent pasting were measured and carcasses were eviscerated to determine abdominal fat, carcass yield, and percentage weight of intestines and viscera. Twenty-four pens (12 per sex), each containing 75 chickens were used in each experiment. Wheat- or barley-based diets were supplemented with flavomycin and a xylanase or a beta-glucanase preparation, respectively, in a 2 x 2 factorial arrangement of treatments. In the wheat diets, xylanase and flavomycin improved feed efficiency, in parallel with a reduction of intestinal viscosity. Xylanase reduced the incidence of vent pasting and the percentage viscera, especially of intestines, and increased abdominal fat. In the barley diets, beta-glucanase and flavomycin improved feed conversion. beta-Glucanase also reduced intestinal viscosity and vent pasting. Both beta-glucanase and flavomycin reduced percentage intestines, but the effects were not additive. In general, the effects of the enzyme preparations and flavomycin were independent, except for percentage intestines with beta-glucanase.
authors.affiliation: Department of Animal Nutrition, Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Centre de Mas Bové, Reus, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Esteve-Garcia
authors.forename: J
authors.initials: J
authors.lastname: Brufau
authors.forename: A
authors.initials: A
authors.lastname: Pérez-Vendrell
authors.forename: A
authors.initials: A
authors.lastname: Miquel
authors.forename: K
authors.initials: K
authors.lastname: Duven
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000032:analysis* / Q000494:pharmacology; D001455:Bambermycins / Q000008:administration & dosage / Q000032:analysis* / Q000494:pharmacology; D001823:Body Composition / Q000187:drug effects / Q000502:physiology; D001835:Body Weight / Q000187:drug effects / Q000502:physiology; D002480:Cellulase / Q000008:administration & dosage / Q000032:analysis / Q000494:pharmacology; D002645:Chickens / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D019587:Dietary Supplements; D004435:Eating / Q000502:physiology; D005260:Female; D005504:Food Analysis; D005769:Gastrointestinal Motility / Q000502:physiology; D006026:Glycoside Hydrolases / Q000008:administration & dosage / Q000032:analysis* / Q000494:pharmacology; D001467:Hordeum; D007422:Intestines / Q000502:physiology; D008297:Male; D008460:Meat / Q000592:standards; D013696:Temperature; D014908:Triticum; D015430:Weight Gain / Q000502:physiology; D043325:Xylan Endo-1,3-beta-Xylosidase; D014995:Xylosidases / Q000008:administration & dosage / Q000032:analysis* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D001455:Bambermycins; D006026:Glycoside Hydrolases; D014995:Xylosidases; D043325:Xylan Endo-1,3-beta-Xylosidase; D002480:Cellulase; C020105:endo-1,6-beta-glucanase