Abstract
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Ch r 0 u s t K.: Dynamics ofGastrointestinal Helminth Injections in Two Systems ofLamb Rearing
Ovoscopic and larvoscopic analyses of faecal samples collected from the ewes and lambs revealed infections with the following 10 genera/species of nematodes: Nematodirus spp., Ostertagia spp., Trichostrongylus spp., Chabertia ovina, Oesophagostomum spp., Bunostomum trigonocephalum, Cooperia spp., Haemonchus contortus, Strongyloides papillosus, and Trichuris ovis
Identical dynamics ofGIN EPG counts were observed in Herd 1and Herd 2, where the ewes had lambed in spring and the lambs were turned out to pasture in the first weeks of their life
Summary
Ch r 0 u s t K.: Dynamics ofGastrointestinal Helminth Injections in Two Systems ofLamb Rearing. In the lambs of Herds 1 and 2, the faecal counts of eggs (EPG) of the gastrointestinal nematodes and Moniezia spp. rose steeply already after the first month of the grazing period and this tendency continued until stopped by anthelmintic treatment. In the lambs of Herd 3, the steep rise in the faecal egg counts was preceded by a two-month period of a slow rise. The marked rise ofEPG ofgastrointestinal nematodes during the lambing period (March, April), known as the "spring rise phenomenon", was observed ewes of Herds 1 and 2, but not of Herd 3. Coccidiosis was no serious problem in the housed lambs and ewes in any of the three herds and OPG counts decreased continuously to a minimum during the grazing period
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