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Type of publication: Diploma Thesis
Type of document:

Year: 2012

Authors: Rahbauer, Markus

Title: Prävalenz von Ascaris suum in Abhängigkeit von der Art der Haltung und den verwendeten Antihelminthika.

Other title: Prevalence of Ascaris suum in relation to management and use of antihelminthics

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 32.


Joachim Anja

Hennig-Pauka Isabel

Vetmed Research Units:
Institute of Parasitology

Graduation date: 25.04.12

Introduction: Endoparasites are an important factor for animal health and economy in pig farming. Especially the nematode Ascaris suum is of importance because it causes the so called “milk spots“, which lead to condemnation of the pig livers at the slaughterhouse. Within the scope of this diploma thesis the prevalence of Ascaris suum in relation to different kinds of housing, management and the application of different anthelminthic treatments was carried out. Materials and Methods: For this purpose 4602 feces samples were evaluated which were examined for eggs of Ascaris suum by flotation. The evaluation was carried out with regard to the prevalence of Ascaris suum in correlation to the floor type, the type of housing, cleaning and disinfection, the frequency of anthelminthic treatment and the kind of anthelminthics used. Samples were taken from farms with piglet rearing, farrowing units, fattening, mating units, and waiting unit. Results: No significant correlation between the mode of housing type in the farrowing unit and the piglet rearing unit could be detected. However, for housing type in the fattening units a significantly higher prevalence of Ascaris suum with continuous allocation compared to the all-in-all-out system was detected. With regard to the floor type significant differences were found in the farrowing unit, the fattening unit, the mating unit und the waiting unit. Even for the type of management in the mating unit and the waiting unit it could be shown that in animals kept single significantly lower rates of Ascaris were detected tcompared to animals in groups or mixed forms. Similarly, different hygiene arrangements had a significant influence on the prevalence of Ascaris suum. If the stables were only cleaned without disinfection significantly more worms were detected than with cleaning and ensuing disinfection. These results were found in the farrowing unit, the pig rearing unit and the fattening unit. A correlation between deworming frequency and worm burden could be shown for sows. Furthermore it could be shown that the choice of the anthelminthic drug had an influence on the prevalence of Ascaris suum. After the use of ivermectin significantly fewer faecal samples were positive for Ascaris eggs than after the use of other antihelminthic agents. Discussion: All in all it could be shown that management factors, hygiene and anthelminthic treatment strategies have a significant influence on the prevalence of Ascaris suum in the conventional pig production.

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