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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

T. Mushtaq^*,1, M. Sarwar^*, G. Ahmad, M. U. Nisa^* and A. Jamil

^* Institute of Animal Nutrition and Feed Technology, and Department of Chemistry, University of Agriculture, Faisalabad, Pakistan 38040; Sadiq Brothers Poultry, Rawalpindi, Pakistan 46000

¹ Corresponding author: tmmirza{at}fsd.paknet.com.pk

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-ß xylanase (22,000 visco units/g) and endo-1,3(4)-ß 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 0.006) and feed conversion ratio (P 0.027). A quadratic (P 0.036) response of digestible Lys was noted for BWG, whereas it was linear (P 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.

Key Words: enzyme supplementation • digestible lysine level • sunflower meal • young broiler

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