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Xylanase Supplementation in Energy-deficient Corn-based Diets: Impact on Broiler Growth, Nutrient Digestibility, Chyme Viscosity and Carcass Proximates |
Bernadette Gerpacio Sta. Cruz1 
, Jun Seon Hong1
, Myunghwan Yu1
, Elijah Ogola Oketch1
, Hyeonho Yun2
, Dinesh Darshaka Jayasena3
, Jung Min Heo1,*
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1Department of Animal Science and Biotechnology, Chungnam National University, Daejeon 34134, Korea
2Technical Marketing, Protein Solution Division, CJ CheilJedang Bio, Seoul 04560, Korea
3Department of Animal Science, Uva Wellassa University, Badulla 90000, Sri Lanka |
Correspondence:
Jung Min Heo, Tel: +82-42-821-5777, Fax: +82-42-825-9754, Email: jmheo@cnu.ac.kr
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Received: 5 September 2023 • Revised: 12 December 2023 • Accepted: 17 January 2024 |
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| Abstract |
Objective
The goal of the current study was to investigate the impact of various concentrations of xylanase in energy-deficient corn-based diets on the growth performance, carcass characteristics, nutrient digestibility, and digesta viscosity in broilers from 7 to 35 days of age.
Methods
A total of 280 seven-day-old Ross 308 broilers were randomly allocated to one of the five dietary treatments following a completely randomized design with 8 replicates and 7 birds per cage. The treatments were: i) positive control (PC, without xylanase); ii) NC-1 (80 kcal/kg ME reduced from PC); iii) NC-2 (100 kcal/kg ME reduced from PC); iv) NCX-1 (NC-1 + 2000 U/kg xylanase); and v) NCX-2 (NC-2 + 3000 U/kg xylanase). Body weight, weight gain, feed intake, and feed conversion ratio were determined weekly to evaluate growth performance. One bird per pen was sacrificed for ileal digesta collection to determine the viscosity and digestibility of energy, dry matter, crude protein on days 24 and 35, however breast and leg meat samples were obtained for proximate analysis (moisture, crude protein, fat, and ash) on day 35.
Results
Birds fed diets supplemented with xylanase regardless of the amount had higher (p<0.05) body weights, daily gains, and improved feed efficiency compared to NC diets all throughout the experimental period. Feed intake was not affected (p>0.05) by the addition of xylanase. Moreover, lowered (p<0.05) viscosity of the ileal digesta were observed upon xylanase inclusion in the diets compared to the birds fed NC diets on day 24. Ileal nutrient digestibility and meat proximate composition were not affected (p>0.05) by xylanase.
Conclusion
The present study indicated that the xylanase at 2,000 U/kg and 3,000 U/kg levels compensates for the 80 kcal/kg and 100 kcal/kg dietary energy levels, respectively, without having adverse effects on the growth performance, carcass characteristics, nutrient digestibility, and digesta viscosity of broilers.
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| Keywords:
Broilers; Carcass; Digestibility; Energy; Enzyme; Performance |
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