Long-nosed cattle louse

Systematic position: The long-nosed cattle louse (Linognathus vituli) belongs to the order Phthiraptera and the family Linognathidae. It is a highly specialized, obligate blood-sucking ectoparasite that spends its entire life cycle on the host, specifically targeting bovine species.

Affected animals: While it can infest cattle of any age, it is most commonly found on calves and young stock. Infestations are often more severe during winter months when animals are kept in closer proximity in indoor environments, facilitating the spread of the parasite.

Biology and life cycle: The species undergoes incomplete metamorphosis. Female lice attach eggs, known as nits, to the hair shafts near the skin surface. After hatching, the nymphs undergo several molts before reaching adulthood. The entire life cycle usually takes about three to four weeks, depending on environmental temperature and host health.

Damage and economic significance: Being blood-feeders, these lice cause intense itching and irritation. Animals react by rubbing and scratching against surfaces, which leads to hair loss, skin lesions, and secondary infections. Chronic infestation results in significant weight loss, stunted growth in calves, and general stress, leading to decreased milk or meat production.

Control measures: Effective management involves the use of registered insecticides, including pour-on formulations, sprays, or injectable endectocides. Control strategies should include:

• Quarantining new animals before introducing them to the herd.
• Routine inspection of livestock for signs of lice presence.
• Concurrent treatment of all animals in the group to break the life cycle.
• Maintaining optimal nutrition and hygiene to support animal resistance.