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Type of publication: Diploma Thesis
Type of document:

Year: 2011

Authors: Weitzer, Tamara

Title: Parasitenmanagement auf einem Gestüt mit Parascaris equorum-Befall der einjährigen Pferde.

Other title: Parasite management on a stud farm with Parascaris equorum infections in yearlings

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 50.


Joachim Anja

Van Den Hoven Rene

Vetmed Research Units:
Institute of Parasitology

Graduation date: 20.06.11

Prophylaxis, metaphylaxis and therapy of equine parasite infections are still important topics of horse keeping management and equine medicine. An increasing number of reports on the failure of macrocyclic lactone treatment to reduce faecal egg count, especially with regard to Parascaris equorum, is published and highlights the importance of strategic control measures to avoid the development of complete ineffectiveness of this and other classes of anthelmintic drugs. Increased frequency of treatment with the same drug class, underdosing of anthelmintics, and treatment of horses without egg excretion are the major reasons for promotion of anthelmintic resistance. On the stud farm of the current study increasing problems concerning the health of the younger horses, such as weight loss, infections of the respiratory tract with nasal discharge, coughing, rough hair and poor growth, were noted. A visit of the facility showed very poor hygiene. Faeces were not removed, neither from the stable, nor from pastures, there was no cleaning or disinfection of the walls, feeding or drinking troughs; fresh straw was spread in the stable only in irregular intervals. It was not clear when the whole bedding had last been replaced and all faeces had been removed completely. Regarding the problems in the young horses it was suggested that parasitism might be the reason. Therapies with ivermectin drugs had been unsuccessful. Faecal examinations still showed high to very high infection levels of the foals with Parascaris equorum. The aims of this study was to (1) find out whether or not the ascarids of the foals were resistant to ivermectin, (2) estimate the current burden of parasites among the horses of different age groups, (3) establish a concept for a better management to avoid further chronic infections with endoparasites.

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