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Testing your own farm's manure is not difficult.
Caution: If fewer than 5 horses are used for egg count reduction tests, the results need to be carefully evaluated unless there is very high efficacy of the product (over 98% reduction in egg shedding) or very low efficacy (less than 80% reduction in egg shedding is consistently seen for all horses). In addition, since egg shedding can vary by as much as 50% from sample to sample, if the % reduction falls in a grey zone - defined as 5% less than the 90% target for benzimidazoles and pyrantel and 95% for ivermectin and moxidectin, then resistance needs to be determined carefully. It may be necessary to repeat the test. If fewer than 5 horses are used for the test, than the grey zone is increased to 10%.
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