The interpretation of the FECRT is described in Figure 1 and is as follows:


Figure 1. Thresholds and interpretation of the FECRT. The grey area represents the interval between the upper and lower thresholds. Scenario 1: Evidence of good efficacy. The lower confidence interval limit is above the lower threshold. Scenario 2: Evidence of resistance. The upper confidence limit is below the upper threshold. Scenario 3: Inconclusive. Both confidence limits fall outside the established thresholds.


4.3. Guideline thresholds and group sizes The full guidelines for FECRT testing can be found in the WAAVP guideline paper, which includes protocols for research studies as well as clinical on-farm testing (Kaplan et al., 2023). This includes details on recommended group sizes depending on the number of eggs counted for each anthelmintic being tested. Note that the number of eggs counted is a function of the number of horses tested, as well as the mean FEC of the horses being tested and the method used for performing the FEC. In the following tables, a summary of these guidelines is presented for scenarios where the minimum number of eggs counted exceeds 40 eggs/horse for both strongyles and ascarids (Tables 2 and 3). For scenarios with fewer eggs counted, the recommended group sizes will be larger. Further details can be found in the WAAVP guidelines.


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