title: The influence of exogenous multienzyme preparation and graded levels of digestible lysine in sunflower meal-based diets on the performance of young broiler chicks two weeks posthatching.
abstract: The study was conducted to investigate the effect of adding multienzyme preparation (Rovabio Excel AP, Adisseo Asia Pacific Pte Ltd., Singapore) at 2 inclusion levels of sunflower meal (SFM; 20 and 30% of the diets) with 3 levels of digestible Lys (0.8, 0.9, and 1.0%) with and without enzyme in a 2 x 2 x 3 factorial arrangement. Each diet was offered to 4 replicates of 51 one-day-old straight-run Hubbard broiler chicks (n = 2448) in a practical vegetable-based mash diet having 2,750 kcal of ME/kg and 19% CP during 2 wk posthatching (1 to 14 d of age). Feed formulation was based on digestible amino acids, which were calculated from the CP and DM contents of each ingredient using AminoDat 2 (Degussa Corp., Allendale, NJ). The enzyme used in this study was authenticated by the supplier to have minimum level of endo-1,4-beta xylanase (22,000 visco units/g) and endo-1,3(4)-beta glucanase (2,000 AGL units/g) and was added at the rate of 50 mg/kg of finished diet. No significant effect of enzyme or level of SFM was observed on BW gain (BWG), feed intake, or mortality during the experimental period. The BWG and feed:gain for birds fed on 30% SFM with enzyme were comparable to those fed on 20% SFM without enzyme during 1 to 14 d of age. However, enzyme at 20% SFM depressed the BWG (P <or=0.006) and feed conversion ratio (P <or=0.027). A quadratic (P <or=0.036) response of digestible Lys was noted for BWG, whereas it was linear (P <or=0.001) for feed:gain during 1 to 7 and 1 to 14 d. A level of 1.0% digestible Lys was observed best for BWG and feed:gain. For BWG, 0.8 and 0.9% digestible Lys was comparable when it was used at 30% SFM, along with enzyme. In conclusion, enzyme supplementation during 2 wk posthatching has no remarkable effect when used in SFM-based diets. Moreover, digestible Lys may be lowered to 0.8% during the first week but not less than 1.0% during the second week post-hatching.
authors.affiliation: Institute of Animal Nutrition and Feed Technology, and Department of Chemistry, University of Agriculture, Faisalabad, Pakistan 38040. tmmirza@fsd.paknet.com.pk
authors.forename: T
authors.initials: T
authors.lastname: Mushtaq
authors.forename: M
authors.initials: M
authors.lastname: Sarwar
authors.forename: G
authors.initials: G
authors.lastname: Ahmad
authors.forename: M U
authors.initials: MU
authors.lastname: Nisa
authors.forename: A
authors.initials: A
authors.lastname: Jamil
mesh_terms: D000375:Aging; D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000254:growth & development*; D004032:Diet / Q000662:veterinary*; D004063:Digestion / Q000187:drug effects; D006368:Helianthus / Q000737:chemistry*; D008239:Lysine / Q000494:pharmacology*; D009097:Multienzyme Complexes / Q000494:pharmacology*
chemical_list: D009097:Multienzyme Complexes; D008239:Lysine