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In Sweden Ostertagia ostertagi and Cooperia oncophora are the most common gastro-intestinal nematodes of young cattle. The infective larvae overwinter on the pastures. Herbage infestation is frequently heavy in May, when the animals are turned out. The number of larvae then falls to a low level at...

Nilsson, O.; Sorelius, L.
Nordisk Veterinaermedicin, 1973, 25, No.2, pp 65-78