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Home » Archive » 2014 » Veterinary Session

Veterinary session

The fate of helmints eggs of sheep on the pasture
Lepres Lilla Bernadett - year 5
SZIU Faculty of Veterinary Science, Department of Parasytology and Zoology
Supervisor: Dr. Gábor Majoros

Abstract:

The parasites of sheep that persist on pastures create the possibility of re-infection of animals, so it is appropriate to examine the viability of eggs and larvae wich can be found in the faeces.

We observed 5 experimental piles of faeces on a pasture. Samples were examined monthly between July 2013 and August 2014 to determine the life span of eggs and larvae of the parasitic helmints, and their survival’s dependence on the seasons.

During the examination the presence of the eggs of lancet flukes (Dicroceolium dendriticum), Moniezia tapeworms, Trichuris ovis and gastrointestinal nematodes (Trichostrongylid) were observed with flotation technique. Trichostrongylid presence was also examined with rearing of larvae. McMaster's counting chamber was used to determine the number of the eggs.

The decrease of the number of the eggs and larvae of trichostrongylidae could be followed quantitatively. The change in the amount of the eggs of other species could not be measured due to the low sensitivity of the McMaster’s method. We could verify only the presence or absence of these.

Results showed in the manure that was placed in July and August that the eggs and larvae of the gastro-intestinal worms survived one month, while Trichuris eggs disappeared in five, lancet fluke eggs in six months. However, the pile that was put on pasture in November, despite the winter frosts, contained Trichostrongylid eggs even in April. The pile that was placed in March 2014 contained intact Trichostrongylid and lancet fluke eggs for 4 months.

The data we gained from this study may help the development of domestic antiparasitic strategies, including choosing the optimal time for rotation of livestock on pasture. With the grazing management designed and constructed like this we can reduce or even eliminate the use of anthelmintics, this could avoid the emergence of drug resistance in worm populations, and could decrease the unknown or known adverse effects of drug-substances on the environment.



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