title: Starch digestibility, energy utilization, and growth performance of broilers fed corn-soybean basal diets supplemented with enzymes.
abstract: A study was conducted to evaluate the effects of dietary α-amylase and β-xylanase supplementation of corn-soy diets, formulated with or without supplemental phytase, on growth performance, energy utilization, and starch digestibility in broiler chickens. A total of 336 slow-feathering, Cobb × Cobb 500 male broilers were randomly distributed to 6 treatments having 8 replicates of 7 birds each. Birds were fed a common starter diet to d 14 post-hatch (3,050 kcal/kg AMEn, 21.7% CP, 1.05% Ca, and 0.53% nPP). The experimental diets were provided afterwards until d 25. A 2 × 3 factorial arrangement of 2 control diets (basal = corn-soy diet without added phytase or PHY = corn-soy diet formulated with 1,000 phytase units/kg) and 3 carbohydrase supplementations (0, 80 kilo-Novo α-amylase units/kg, or 80 kilo-Novo α-amylase units/kg + 100 fungal β-xylanase units/kg) was used from d 14 to 25. Excreta were collected from 21 to 24 d and all birds were euthanized at 25 d for jejunum and ileum content collection. Samples of feed, excreta, and jejunal and ileal digesta were analyzed for determination of total tract retention and ileal apparent digestibility. No interactions between diet and carbohydrase were observed. Broilers fed diets formulated with phytase or supplemented with amylase + xylanase had higher BW gain (BWG) and lower FCR (P < 0.05) when compared with birds fed diets without carbohydrases. Relative to the basal diet, AMEn was increased (P < 0.01) by 70 kcal/kg and 99 kcal/kg when birds were fed the diet supplemented with amylase and amylase + xylanase, respectively. Starch digestibility in the jejunum and ileum was increased (P < 0.05) by 3.5% and 2.4%, respectively, when birds were fed the diet supplemented with amylase + xylanase. Results from this experiment show that corn-soy diets having phytase and supplemented with amylase and xylanase led to increased growth performance, AMEn, and starch digestibility in broilers. Furthermore, the efficacy of exogenous amylase and xylanase was independent of the presence of microbial phytase.
authors: Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 7712, Porto Alegre, RS, Brazil, 91540-000.
authors: C
authors: C
authors: Stefanello
authors: Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 7712, Porto Alegre, RS, Brazil, 91540-000 slvieira@ufrgs.br.
authors: S L
authors: SL
authors: Vieira
authors: Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 7712, Porto Alegre, RS, Brazil, 91540-000.
authors: G O
authors: GO
authors: Santiago
authors: Departamento de Medicina Veterinária Preventiva, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 8834, Porto Alegre, RS, Brazil, 91540-000.
authors: L
authors: L
authors: Kindlein
authors: DSM Nutritional Products, Av. Engº Billings, 1729, São Paulo, SP, Brazil, 05321-010.
authors: J O B
authors: JO
authors: Sorbara
authors: DSM Nutritional Products, Wurmisweg 576, 4303 Kaiseraugst, Switzerland.
authors: A J
authors: AJ
authors: Cowieson
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000254:growth & development / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D004040:Dietary Carbohydrates / Q000378:metabolism; D019587:Dietary Supplements / Q000032:analysis; D004063:Digestion / Q000187:drug effects; D043364:Endo-1,4-beta Xylanases / Q000008:administration & dosage / Q000378:metabolism*; D002149:Energy Intake / Q000502:physiology*; D008297:Male; D011897:Random Allocation; D013025:Glycine max / Q000737:chemistry; D013213:Starch / Q000378:metabolism*; D003313:Zea mays / Q000737:chemistry; D000516:alpha-Amylases / Q000008:administration & dosage / Q000378:metabolism*
chemical_list: D004040:Dietary Carbohydrates; D013213:Starch; D000516:alpha-Amylases; D043364:Endo-1,4-beta Xylanases
keywords: amylase; broiler; metabolizable energy; starch; xylanase