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In an experimental flock of Polish long-wool sheep (PL), rams and ewes were progressively replaced by Blackface (Bl) and Weisses Alpenschaf (WA) sheep. The ewes and their lambs were naturally infected with predominantly Teladorsagia circumincta and Haemonchus contortus nematode species. A survey was done from 1995 to 2000 by regular FECs. Significant fixed effects were: the timing of last anthelmintic...
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