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Manure management reduces levels of antibiotics and antibiotic resistance genes
Date:11/28/2007

ncentrations of the several tetracycline antibiotics than the dairy manure. After four months of treatment, tet(W) and tet(O) decreased significantly in dairy manure, but two more months of treatment were necessary for similar reductions of ARG in the feedlot manures.

The results showed that HIM was more effective than LIM at increasing the rate of antibiotic dissipation, but it was not a significant factor in reducing the levels of ARG. The length of treatment time was the main factor in reducing the levels of both antibiotics and ARG. For manures with initially high levels of antibiotics, treatment times of at least six months may be necessary for a significant reduction in levels of antibiotics and ARG. The results also provided evidence that ARG may be present for extended time periods even after antibiotics have fully dissipated.

Scientists at Colorado State University are continuing research in this area by examining full-scale local on-farm waste management practices. Together this research will lead to a better understanding of possible ARG mitigation strategies so that best management practices can be developed to reduce the effects that animal waste may have on the spread of ARG.


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Contact: Sara Uttech
suttech@agronomy.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

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