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| Decreases of Tetracyclines and Antibiotics-Resistant Bacteria During Composting of Chicken Manure |
| Received:December 28, 2014 |
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| KeyWord:tetracycline;composting;tetracycline-resistant bacteria;composting agent |
| Author Name | Affiliation | E-mail | | QIU Tian-lei | Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | | | GAO Min | Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | | | HAN Mei-lin | Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | | | WANG Xu-ming | Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | wangxuming@baafs.net.cn |
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| Abstract: |
| Veterinary antibiotics are widely used as feed additives in livestock breeding for growth promotion and disease prevention. Composting may provide a practical and economical solution for reducing the risks of antibiotic pollution to the environment. A pilot field study was conducted to investigate the changes of antibiotics[tetracycline(TC) and oxytetracycline(OTC)] and tetracycline-resistant bacteria(TRB) during composting of chicken manure mixed with goat manure. Results showed that both temperature and degradation rates of OTC were higher in the manure inoculated with microbial composting agents(CA) than that without microbial agents(CK). The content of residual OTC in the manure decreased from 76 μg·kg-1 to below the detectable limit after 47 day of composting. However, OTC content in CK did not change during composting. Tetracycline(TC) disappeared rapidly in both CA and CK 17-days after composting. Salmonella in the manure were killed in both CA and CK treatments within 8 days, whereas coliforms were continuously detected until the 47th day. Over the 47-day composting, TRB decreased by 1.41 lg CFU·g-1 in CA and 1.60 lg CFU·g-1 in CK, compared to the initial. However, the proportion of TRB to total bacteria increased at beginning and then declined, but the TRB proportion was still 4.00%(CA) and 1.17%(CK) higher at the end than at the beginning. |
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