One of the methods for determining anthelmintic (dewormer) resistance is the Fecal Egg Count Reduction Test (FECRT). Fecal samples from individual animals are compared before or after treatment or to a control group after treatment. It is recommended that at least 15 animals be sampled.
Their research showed the mean fecal egg counts from the composite and individual fecal samples to be 98.9% in agreement. The fecal egg count reduction of the composite and individual samples was 95.9% in agreement.
The researchers concluded that composite sampling is a practical tool for producers to assess resistance and that is should improve parasitological testing among producers. Methods of composite sampling are discussed in the article.
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