Abstract
A macrocyclic lactone, LL-F28249α, C 36H 52O 8, was evaluated as a one- or two-injection treatment in different formulations and concentrations against cattle infested with Psoroptes ovis (Hering). One injection of 2 mg kg −1 or two injections of 1 mg kg −1 of 3% active material in either an aqueous or oil formulation failed to eliminate all of the mites. A single injection of 3 mg kg −1 as a 5% aqueous formulation (3%), the male mites appeared to be less susceptible to the acaricide than either the female or immature mites.
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