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
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.
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