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The fate and effect of oxytetracycline during the anaerobic digestion of manure from therapeutically treated calves

Paper ID Volume ID Publish Year Pages File Format Full-Text
36427 45132 2006 7 PDF Available
Title
The fate and effect of oxytetracycline during the anaerobic digestion of manure from therapeutically treated calves
Abstract

The fate of antibiotic residues in the manure of treated animals is of considerable concern because of the potential development of antibiotic-resistant bacteria in the environment and because of the effect of these residues on manure treatment systems. The objective of this study was to determine the fate and effect of oxytetracycline (OTC) during the anaerobic digestion of manure from medicated calves. Five beef calves were medicated for 5 days with 22 mg/kg/day of OTC. Manure samples collected from calves prior to and after medication were diluted five-fold with water, loaded into replicate 1.2 l anaerobic digesters and incubated at 35 °C. OTC levels in the manure slurry decreased from 9.8 ± 0.1 to 4.1 ± 0.1 mg/l in 64 days (59% removal) yielding a calculated value half-life for OTC of 56 days. Levels of the OTC epimer 4-epi-oxytetracycline increased gradually from 0.55 ± 0.03 mg/l at the start of experiment to 1.3 ± 0.1 mg/l on day 27 and then decreased to 0.84 ± 0.04 mg/l on day 64. Levels of two other OTC metabolites (α-apo-oxytetracycline and β-apo-oxytetracycline) decreased or remained unchanged during the anaerobic digestion process. Cumulative biogas production was 27% lower from digesters containing manure from medicated calves relative to that from digesters containing unmedicated manure. However, the presence of OTC did not show other negative effects on process stability as there were no significant differences in biogas methane content or in reductions of volatile solids and soluble organic carbon.

Keywords
Oxytetracycline; Anaerobic Digestion; Manure; Antibiotic; Fate; Inhibition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 7, July 2006, Pages 1637–1643
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us