DEGRADATION OF TYLOSIN AND METABOLITE PRODUCTION IN ANAEROBIC AND AEROBIC SWINE MANURE SLURRIES

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Abstract:

Due to increased numbers of confined animal feeding operations (CAFOs) and use of antibiotics for therapeutics and growth promotion, contamination of water bodies with antibiotic residues is becoming a critical issue. Degradation studies using manure lagoon slurry were conducted to understand the fate of a common growth-promoting drug, tylosin, in manure. The 90% disappearance time for tylosin in anaerobically incubated slurry was approximately 40 hours. Aerating the slurries reduced the 90% disappearance times to approximately 12 hours. Strong sorption to slurry solids was most likely the primary mechanism of tylosin loss although biodegradation and abiotic degradation cannot be ruled out. Two degradates, dihydrodesmycosin and a degradate product with molecular mass of 934 were identified in the studies. Residual tylosin remained in slurry after 8 months incubation, indicating that tylosin degradation in lagoons is incomplete and that tylosin residues may be carried over to agricultural fields.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864704784147737

Publication date: January 1, 2004

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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