The Persistent Efficacy of MLs Against Cattle Ectoparasites

Until the introduction of the avermectins, no single product could simultaneously provide control of mange, lice and other important ectoparasites as well as the important endoparasites of cattle. Moreover, the introduction of the MLs was an important improvement in the control of cattle obligate ectoparasites, as previous acaricides and insecticides rarely approached a 100% efficacy and repeated treatments were required. It must be stressed that, and in contrast to infections with nematodes, an adequate control of infestations with ectoparasites requires almost a 100% efficacy against the stages on the cattle.

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