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Endoparasites of horses
Scháňková, Štěpánka ; Langrová, Iva (advisor) ; Bejček, Vladimír (referee)
Nine ponies were randomly allocated to one of three groups (A, B, C). Gradually, these groups of ponies were experimentally infected with third stage cyathostome larvae. Each pony was infected with 30,000 infective cyathostome larvae stored 4 weeks under the natural environmental conditions of the Czech Republic. These animals were examined post--mortem for small strongyle infections from October 2011 to January 2012. Seventeen species of the following Cyathostominae genera were identified: Coronocyclus, Cyathostomum,Cylicocyclus, Cylicostephanus, Gyalocephalus and Petrovinema. Of the 17 species of Cyathostominae recovered, Cyathostomum catinatum, Cyathostomum alveatum and Cylicocyclus nassatus were the most prevalent (100 %). From the entire population of Cyathostominae, 65,6 % were located in the caecum and only 34,4 % in the colon. Only 1,736 (24,6 %) females and 5,329 (75,4 %) males were observed. In the first and second phase (group A, B) of the experiment, 98.57 % and 95.48 % of adult nematodes were found, respectively. However, only 29,07% of adults were found in the third phase (group C) of experiment, and the proportion of arrested larvae (EL3) was 67.73%. All ponies were treated orally with ivermectin at a dosage of 400 ug /kg. However, adult Oxyuris equi were present in six horses. This is the first European study to demonstrate anthelmintic resistence in Oxyuris equi to macrocyclic lactones.
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