Dave Boxler, University of Nebraska Extension
Treating cattle for lice when it is convenient—usually during preconditioning and preg-checking—isn’t necessarily the most effective approach.
While late summer and early fall endectocide (drugs that kill both internal and external parasitic insects) treatment may work on most internal parasites and horn flies, lice may escape.
Nebraska cattle are usually infested with more than one species of lice, and calves, yearlings and older poor-conditioned cattle usually have the heaviest lice infestations. Heavy louse populations can lower milk…
