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Lice over-summer instead of over-winter like many parasites. They hide on cattle in folds between the legs and body and the dewlap. One type of louse can even over-summer in the ear. Once they get cold, they wake up and start reproducing. If cattle are treated too early, the lice don’t become an issue until several months into an endectocide product’s duration of use.
Because of changing weather patterns, if an endectocide is given at fall processing, there is a chance part of the lice population isn’t active yet. Delousing won’t be fully effective if done too early.” – David J. Boxler
Source: BEEF, September 1, 2024. Link.