Tiabendazol og fenbendazol til bekjempelse av parasitter hos unghingster. Resistens mot fenbendazol hos smaa stongylider.
1986
Heller O.
Examination of faecal pads which had been left over winter on common pastures for young stallions, showed that 73,1 % and 69,8 % of the samples from lowland pastures and a mountain pasture (1100 m.a.s. level), respectively, contained live larvae of nematodes within the family Strongylidae. Larvae of Strogylus vulgaris were found from all pastures investigated. Treatment of the horses with thiabendazole or fenbendazole before turning out in the spring, reduced the number of strongyle eggs in the faeces to a low level. In spite of this treatment, there were rather high numbers of eggs in the faeces at the end of the grazing period. An additional treatment, 7-8 weeks after turnout, brought the egg counts down to a low level, and in consequence there was a much lower pasture contamination in the autumn. After the annual use of thiabendazole for 6 years and fenbendazole in spring and mid-summer for 10 years, there seemed to be reduced effect of fenbendazole. In the autumn of 1985, young stallions from two pastures showed an average reduction in the number of Cyathostominae-eggs of about 75 % after treatment with fenbendazole, but the effect was much lower in some animals. After further treatments with either pyrantel pamoat or ivermectin, no eggs were found in the faeces. The principles of using anthelmintics to horses are discussed.
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