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Observations over 4 winters indicated the survival of the free-living stages of Ostertagia ostertagi, Nematodirus helvetianus, Cooperia oncophora, C. punctata, Trichuris sp., and Moniezia sp. on blue-grass pasture in central Kentucky. There was no evidence that Haemonchus sp. and Oesophagostomum...

Drudge, J. H.; Leland, S. E. Jr.; Wyant, Z. N.; Rust, J. W.
Journal of Parasitology, 1958, 44, pp 434-438