Post-dehelminthizational population dynamics of digestive tract strongylates by sheep grazing on contaminated pastures
1996
Kaarmaa, A. | Maegi, E. (Estonian Agricultural Univ., Tartu (Estonia). Veterinary Research Center)
Post-dehelminthizational population dynamics of sheep digestive tract strongylates was investigated in Estonian conditions. Our observations were carried out during 3 months after sheep dehelminthizations. The extent of invasion in sheep before the treatment was high (81 plus minus 55). Fenbendazol, febanthel and ivermectin containing preparations were used in our tests. After dehelminthizations change of sheep pastures did not occur. According to our data, at 10 and 20 days after dehelminthization the extent of invasion was 2 plus minus 2 per cent and 4 plus minus 4 per cent respectively. Significant differences in sheep invasion level after treatment procedures with different anthelminthics were not noticed. At 30 days after dehelminthization the mean extent of invasion was 22 plus minus 6 per cent, after 60 days 34 plus minus 7 per cent and after 90 days 53 plus minus 7 per cent. At 30, 60 and 90 days after the treatment with ivermectin the extent of invasion was significantly lower compared with other groups
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