Studies on sheep digestive tract parasites in Estonia
2004
Maegi, E.(Estonian Agricultural Univ., Tartu (Estonia). Faculty of Veterinary Medicine) | Sahk, M.(Estonian Agricultural Univ., Tartu (Estonia). Faculty of Veterinary Medicine)
The objective of this study was to investigate population dynamics and viability of strongylid larvae on pastures in natural conditions. According to our data, strongylid infections of sheep digestive tract are the most spread parasitic diseases in Estonia. Our observations have shown that the pastures contaminated with parasites of the previous year are the main sources of invasion next year. In purpose to estimate the viability of strongylid larvae on sheep pastures, 5 trials with lambs have been carried out in different pasture regimes. All lambs allowed to faecal examinations for numbers of parasite eggs once a week. Our observations have showed that most of strongylid larvae did not survive the winter period, but part of them remained viability up to next grazing period. According to our results, strongylid larvae can be transferred to deep soil layers by earthworms and can be remain viable during whole winter period. To avoid sheep infections, the main prophylactic principle is separate grazing of lambs from ewes because they are main infection sources in spring.
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