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Sixteen young dairy cows were randomly allocated to 4 groups of 4 animals each: Group 1 cows were each given a single Ivomec SR Bolus; Group 2 cows were treated with the Ivomec Pour-on formulation; Group 3 cows were injected with the Ivomec Subcutaneous Injection; Group 4 cows were untreated controls. Blood and faecal samples were collected from all cows on the day before treatment and on days 1,...