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https://doi.org/10.5713/ab.21.0534    [Accepted] Published online June 30, 2022.
Efficacy of combination of endo-xylanase and xylan-debranching enzymes in improving application of cereal bran in piglet diet
Weiwei Wang1  , Dawen Zheng2  , Zhenzhen Zhang2  , Hui Ye1  , Qingyun Cao1  , Changming Zhang1  , Zemin Dong1  , Dingyuan Feng1  , Jianjun Zuo1,* 
1College of Animal Science, South China Agricultural University, Guangzhou 510642, China
2AsiaPac Bio-Technology Co. Ltd, Dongguan 523808, China
Correspondence:  Jianjun Zuo, Tel: +86-020-82105323, Fax: +86-020-82105323, Email: zuoj@scau.edu.cn
Received: 7 December 2021   • Revised: 14 January 2022   • Accepted: 27 June 2022
Abstract
Objective
This study was aimed to explore the efficacy of combination of endo-xylanase (Xyn) and xylan-debranching enzymes (arabinofuranosidase, Afd and feruloyl esterase, FE) in improving utilization of bran in piglet diet.
Methods
In vitro experiments were firstly conducted to examine the enzymological properties of Xyn, Afd and FE, concurrent with their effect on degradation of arabinoxylan (Abx) in bran. In vivo experiment was then implemented by allocating two hundred and seventy 35-d-old postweaning piglets into 3 groups (6 replicates/group), which received bran-containing diet supplemented with Xyn (1600 U/kg) or its combination with Afd (0.8 U/kg) and FE (4 U/kg) or without enzyme.
Results
Both Xyn, Afd and FE are relatively stable against the changes in temperature and pH value. Combining Xyn with Afd and FE had a superiority (p<0.05) over Xyn alone and its combination with Afd or FE in promoting (p<0.05) degradation of Abx in different brans. Combined treatment with Xyn, Afd and FE was more beneficial than Xyn alone to induce increasing trends (p<0.10) of average daily gain, final body weight and feed efficiency of piglets fed bran-containing diet. Moreover, combination of Xyn, Afd and FE showed advantages (p<0.05) over Xyn alone in causing reductions (p<0.05) in diarrhea rate and cecal pH value, concurrent with increases (p<0.05) in cecal and colonic acetic acid and total volatile fatty acid concentrations, as well as cecal butyric acid concentration of piglets fed bran-containing diet.

Conclusion

Combining Xyn with Afd and FE was more beneficial than Xyn alone in promoting degradation of Abx in bran, along with growth performance and intestinal volatile fatty acid profile of piglets received bran-containing diet. Thereby, combination of Xyn, Afd and FE had a superior efficacy relative to Xyn alone in improving application of cereal bran in piglet diet.
Keywords: Arabinoxylan; Bran; Debranching Enzyme; Intestine; Piglet; Xylanase
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