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A morantel tartrate bolus was administered to nine calves aged 4-5 months, before turning out in June. These and 9 untreated calves were subject to rotational grazing on 8 plots previously grazed by adult cattle. Faecal egg counts remained lower than those of the controls for 3 months. Some calves...

Hertzberg, H.; Durgiai, B.; Kohler, L.
Schweizer Archiv für Tierheilkunde, 1992, 134, 8, pp 375-380