title: Feeding value of field beans (Vicia faba L. var. minor) with and without enzyme containing tannase, pectinase and xylanase activities for broilers.
abstract: Effects of field beans with various tannin content and exogenous enzyme mixture containing tannase, pectinase and xylanase activities on N-corrected dietary apparent metabolisable energy (AMEn), coefficients of dry matter (DMR) and nitrogen retention (NR), fat digestibility, gastrointestinal tract (GIT) development, jejunal villus morphometry, ileal digesta viscosity and sialic acid were examined. Birds' growth performance and energy conversion ratio (ECR) were also measured. Birds were fed one of eight mash diets. The Control diet contained as major ingredients wheat (400 g/kg) and soybean meal (SBM) (127 g/kg and 221 g crude protein/kg and 12.83 MJ AMEn/kg. To reduce nutrient density, the Control diet also contained washed sand at 119 g/kg. Another three diets containing 300 g/kg of each of three experimental field bean cultivar samples in replacement for SBM and sand were also mixed. Each diet was fed to nine pens with two male Ross 308 broilers. Diets high in tannin had low AMEn, ECR, DMR and NR (p < 0.001). Feeding field beans increased (p < 0.001) the weights of the pancreas and the proventriculus and gizzard (PG) of the birds. Supplementing diets with the enzyme mixture improved (p < 0.001) feed conversion efficiency, AMEn and all nutrient utilisation coefficients despite the tannins in diets. The enzyme mixture reduced ileal digesta viscosity (p < 0.001) and the weight of pancreas, total GIT and PG (p < 0.05) of the birds. It can be concluded that the feeding value of field beans with different tannin contents may vary when fed to broilers. The supplementation of the enzyme mixture improved the feeding value of diets for broilers. The beneficial effect of the addition of the enzyme mixture seems to be mediated through reduced ileal digesta viscosity and improved nutrient availability.
authors.affiliation: a Department of Animal Production, Welfare and Veterinary Sciences , Harper Adams University , Newport , UK.|b National Institute of Poultry Husbandry , Harper Adams University , Newport , Shropshire , UK.
authors.forename: Jalil Mahmwd
authors.initials: JM
authors.lastname: Abdulla
authors.affiliation: a Department of Animal Production, Welfare and Veterinary Sciences , Harper Adams University , Newport , UK.|b National Institute of Poultry Husbandry , Harper Adams University , Newport , Shropshire , UK.
authors.forename: Stephen Paul
authors.initials: SP
authors.lastname: Rose
authors.affiliation: a Department of Animal Production, Welfare and Veterinary Sciences , Harper Adams University , Newport , UK.
authors.forename: Alexander Mackay
authors.initials: AM
authors.lastname: Mackenzie
authors.affiliation: a Department of Animal Production, Welfare and Veterinary Sciences , Harper Adams University , Newport , UK.|b National Institute of Poultry Husbandry , Harper Adams University , Newport , Shropshire , UK.
authors.forename: Vasil Radoslavov
authors.initials: VR
authors.lastname: Pirgozliev
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002265:Carboxylic Ester Hydrolases / Q000378:metabolism; D002645:Chickens / Q000254:growth & development / Q000502:physiology*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements / Q000032:analysis; D004063:Digestion; D043364:Endo-1,4-beta Xylanases / Q000378:metabolism; D004734:Energy Metabolism; D041981:Gastrointestinal Tract / Q000254:growth & development; D007082:Ileum / Q000033:anatomy & histology / Q000502:physiology; D008297:Male; D009753:Nutritive Value; D011096:Polygalacturonase / Q000378:metabolism; D011897:Random Allocation; D031307:Vicia faba / Q000737:chemistry / Q000201:enzymology*
chemical_list: D002265:Carboxylic Ester Hydrolases; C022711:tannase; D011096:Polygalacturonase; D043364:Endo-1,4-beta Xylanases
keywords: Broilers; digestibility; field bean (Vicia); metabolizable energy; morphometrics; performance; tannase