title: Influence of enzyme supplementation and heat processing of barley on digestive traits and productive performance of broilers.
abstract: We studied the influence of enzyme supplementation (ES) of the diet and heat processing (HP) of barley on digestive traits and productive performance of broilers from 1 to 42 d of age. There were 6 diets arranged factorially with 2 doses (0 and 500 ppm) of a fungal enzyme complex with beta-glucanase and xylanase activity and 3 HP of barley (raw, micronized, and expanded). In addition, a control diet based on raw corn without ES was also included from 1 to 21 d of age. Enzymes reduced intestinal viscosity (IV) at all ages (P < or = 0.001) and water intake at 21 d of age (P < or = 0.01) and increased DM of the ileal contents at 28 d (P < or = 0.001). Also, ES increased total tract apparent retention of nutrients and BW gain and feed conversion ratio from 1 to 42 d of age (P < or = 0.001). Heat processing of barley increased IV at 7 and at 28 d of age, and DM of ileal contents (P < or = 0.05) at 28 d of age. In addition, HP improved feed intake (P < or = 0.01) and BW gain (P < or = 0.001) from 1 to 7 d of age, but the effects disappeared after 21 d of age. From 1 to 7 d of age, chicks fed micronized barley had higher IV, gained less weight, and had poorer feed conversion ratio than chicks fed expanded barley (P < or = 0.05). It is concluded that barley with enzymes can substitute for all of the corn in diets fed to broilers from 1 to 21 d of age. Enzymes improved digestive traits, retention of nutrients, and broiler performance from 1 to 42 d of age, and HP of barley improved performance from 1 to 7 d of age. The effects of HP of barley on broiler performance were more evident with expansion than with micronization.
authors.affiliation: Department of Animal Science, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040 Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: García
authors.forename: R
authors.initials: R
authors.lastname: Lázaro
authors.forename: M A
authors.initials: MA
authors.lastname: Latorre
authors.forename: M I
authors.initials: MI
authors.lastname: Gracia
authors.forename: G G
authors.initials: GG
authors.lastname: Mateos
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000254:growth & development*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D004063:Digestion / Q000187:drug effects / Q000502:physiology*; D005260:Female; D005511:Food Handling / Q000379:methods*; D001467:Hordeum / Q000737:chemistry*; D006358:Hot Temperature; D008297:Male; D043325:Xylan Endo-1,3-beta-Xylosidase / Q000008:administration & dosage* / Q000494:pharmacology
chemical_list: D043325:Xylan Endo-1,3-beta-Xylosidase