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  • Title: Comparison of the reappearance of strongyle eggs on foals, yearlings and adult horses after treatment with ivermectin or pyrantel.
    Author: Boersema JH, Eysker M, Maas J, van der Aar WM.
    Journal: Vet Q; 1996 Mar; 18(1):7-9. PubMed ID: 8833604.
    Abstract:
    The reappearance of strongyle eggs in faeces after treatment with ivermectin or pyrantel embonate was investigated in 22 foals, 36 yearlings, and 45 adult horses on five Dutch horse farms. The results confirmed earlier studies which showed an egg reappearance period of 9 and 6 weeks after ivermectin and pyrantel treatment, respectively. There were no differences between the egg reappearance periods of foals, yearlings, and adult horses. The mean egg counts of the yearlings were, however, consistently higher than the mean egg counts of the adult horses and foals in both ivermectin- and pyrantel-treated animals. It is concluded that shorter treatment intervals in foals and yearlings are not obligatory. However, longer intervals must be prevented in yearlings because their contribution to pasture contamination is relatively high.
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