Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Analysis of excreta bacterial community after forced molting in aged laying hens

  • Han, Gi Ppeum (Department of Animal Science and Technology, Chung-Ang University) ;
  • Lee, Kyu-Chan (Department of Systems Biotechnology, Chung-Ang University) ;
  • Kang, Hwan Ku (Poultry Research Institute, National Institute of Animal Science, Rural Development Administration) ;
  • Oh, Han Na (Department of Systems Biotechnology, Chung-Ang University) ;
  • Sul, Woo Jun (Department of Systems Biotechnology, Chung-Ang University) ;
  • Kil, Dong Yong (Department of Animal Science and Technology, Chung-Ang University)
  • Received : 2019.03.06
  • Accepted : 2019.05.29
  • Published : 2019.11.01
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Abstract

Objective: As laying hens become aged, laying performance and egg quality are generally impaired. One of the practical methods to rejuvenate production and egg quality of aged laying hens with decreasing productivity is a forced molting. However, the changes in intestinal microbiota after forced molting of aged hens are not clearly known. The aim of the present study was to analyze the changes in excreta bacterial communities after forced molting of aged laying hens. Methods: A total of one hundred 66-wk-old Hy-Line Brown laying hens were induced to molt by a 2-d water removal and an 11-d fasting until egg production completely ceased. The excreta samples of 16 hens with similar body weight were collected before and immediately after molting. Excreta bacterial communities were analyzed by high-throughput sequencing of bacterial 16S rRNA genes. Results: Bacteroidetes, Firmicutes, and Proteobacteria were the three major bacterial phyla in pre-molting and immediate post-molting hens, accounting for more than 98.0%. Lactobacillus genus had relatively high abundance in both group, but decreased by molting (62.3% in premolting and 24.9% in post-molting hens). Moreover, pathogenic bacteria such as Enterococcus cecorum and Escherichia coli were more abundant in immediate post-molting hens than in pre-molting hens. Forced molting influenced the alpha diversity, with higher Chao1 (p = 0.012), phylogenetic diversity whole tree (p = 0.014), observed operational taxonomic unit indices (p = 0.006), and Simpson indices (p<0.001), which indicated that forced molting increased excreta bacterial richness of aged laying hens. Conclusion: This study improves the current knowledge of bacterial community alterations in the excreta by forced molting in aged laying hens, which can provide increasing opportunity to develop novel dietary and management skills for improving the gastrointestinal health of aged laying hens after molting.

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