cattle Articles
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Non‐target effects of ivermectin residues on earthworms and springtails dwelling beneath dung of treated cattle in four countries
The authorization of veterinary medicinal products (VMP) requires that they be assessed for non‐target effects in the environment. Numerous field studies have assessed these effects on dung organisms. However, few studies have examined effects on soil‐dwelling organisms, which might be exposed to VMP residues released during dung degradation. We compared the abundance of earthworms and ...
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A four‐country ring test of nontarget effects of ivermectin residues on the function of coprophilous communities of arthropods in breaking down livestock dung
By degrading the dung of livestock that graze on pastures, coprophilous arthropods accelerate the cycling of nutrients to maintain pasture quality. Many veterinary medicinal products, such as ivermectin, are excreted unchanged in the dung of treated livestock. These residues can be insecticidal and may reduce the function (i.e., dung‐degradation) of the coprophilous community. In the present ...
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Validation of a standard field test method in four countries to assess the toxicity of residues in dung of cattle treated with veterinary medical products
Registration of veterinary medical products (VMPs) includes the provision that field tests may be required to assess potential non‐target effects associated with the excretion of product residues in dung of treated livestock (Phase II, Tier B testing). However, regulatory agencies provide no guidance on the format of these tests. Here, we report development of a standardized field test method ...
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Assessment of swine-specific bacteriophages of Bacteroides fragilis in swine farms with different antibiotic practices
We assessed the occurrence and specificity of bacteriophages of Bacteroides fragilis in swine farms for their potential application in microbial source tracking. A local B. fragilis host strain, SP25 (DSM29413), was isolated from a pooled swine feces sample taken from a non-antibiotic farm. This strain was highly specific to swine fecal materials because it did not detect bacteriophages in ...
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