The survival of nematodes and cestodes of sheep in the pasture during the winter in eastern Norway
Helle, O.
Acta Veterinaria Scandinavica 12(4): 504-512
1971
ISSN/ISBN: 0044-605X PMID: 5169165 Document Number: 38306
Using 21 worm-free lambs in paddocks on old sheep pastures on 4 farms near Oslo, it was found that Nematodirus., Ostertagia., and Moniezia were the only helminths which could survive the winter in the pasture in great numbers. A few Teladorsagia davtiani, Chabertia ovina, Trichuris ovis, Cooperia onchophora and Skrjabinema ovis survived the winter. Trichostrongylus axei, T. vitrinus and Oesophagostomum venulosum showed a negligible ability to survive the winter in the pasture. The following species were never found to survive: Haemonchus contortus, Trichostrongylus colubriformis, Bunostomum trigonocephalum, Cooperia curticei and Strongyloides papillosus..