9.1. Recommendations for mature horses (5-15 years) Primary target parasites are strongyles and tapeworms.
• Evaluate the efficacy of the anthelmintic products used on each operation on an annual basis using the FECRT.
• Baseline treatments should consist of one or two macrocyclic lactone treatments per year to target large strongyles, bots, and spirurid nematodes responsible for causing summer sores (Habronema spp. and Draschia spp.), where indicated. Praziquantel should be included for tapeworms at least once a year, if horses have access to green pastures. Additional treatments for tapeworms should be given only based on positive evidence of infection.
• All further treatments should be targeting high strongyle shedders (> 500 EPG). Depending on the duration of the strongyle transmission season (Figure 2), high shedders should be treated with one or two additional treatments. All treatments aimed at reducing pasture infectivity should be administered during the transmission season.
9.2. Considerations for seniors (>15 years) Senior horses should generally follow the recommendations given for mature horses. However, some seniors can revert to becoming high strongyle shedders (Adams et al., 2015), and pituitary pars intermedia dysfunction, which is commonly occurring in this age group, has been associated with higher counts as well (McFarlane et al., 2010). Thus, it is important to monitor egg shedding status in this age group and treat accordingly.
9.3 Recommendations for foals, weanlings, yearlings, and youngsters In order of appearance, primary target parasites are ascarids, strongyles, and tapeworms.
• Perform FECRT yearly to evaluate the efficacy of anthelmintics against strongyles and ascarids. The ideal age range for ascarid FECRTs is 4–6 months of age, when ascarid egg shedding is most likely to be abundant.
• Targeted treatments (selective therapy) based on FEC is NOT recommended in this age group. However, FECs are still important for monitoring the presence of ascarids, as these will often require different anthelmintic classes than strongyles.
• Although S. westeri larvae are known to transmit lactogenically, the possible benefits to treating the mare around the time of foaling are unknown, and there is no basis for recommending this practice at present.
• Foals should be treated twice for ascarids. The first treatment should be administered at about 2–3 months of age, while the second is recommended at about 5 months of age. The benzimidazole drug class is recommended for these treatments, although pyrantel pamoate may also be effective. The labeled dose of fenbendazole and oxibendazole for ascarids is 10 mg/kg orally once.
• At about 5–6 months of age, the first FEC is recommended to track the expected natural decline of ascarids and the subsequent dominance of strongyles.
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