Adult forms of bovine lice (Haematopinus eurysternus) located in the vulvar area. In temperate climate zones, they affect young and adult animals during the winter. They also localize around the eyes, and on the nape, neck, withers, back, and tail, causing intense itching. Following licking and rubbing, areas of broken hair or skin lesions from self-trauma may be observed.
They can cause significant economic damage due to delayed growth and reduced milk production.
Treatment: pour-on insecticides (deltamethrin, flumethrin) to be repeated after 2-3 weeks to target lice that have just hatched from eggs, which are resistant to treatment.
