How to treat lice on a calf? - briefly
Apply a veterinary‑approved insecticidal spray or dip containing permethrin or pyrethrin, following label dosage and ensuring full coverage of the calf’s skin and hair. Repeat the treatment after 7–10 days and keep the environment clean to prevent re‑infestation.
How to treat lice on a calf? - in detail
Lice infestations on young cattle require prompt identification and systematic control. Begin by confirming the presence of parasites: inspect the calf’s skin, especially around the neck, shoulders, and udder, for live insects, eggs (nits), or excessive scratching. Record the severity to guide treatment intensity.
Select an appropriate therapeutic agent. Options include:
- Topical insecticidal sprays – contain pyrethroids (e.g., permethrin) or organophosphates; apply to the entire body, ensuring coverage of the dorsal and ventral surfaces. Follow the manufacturer’s concentration guidelines, typically 0.5–1 ml per kilogram of body weight.
- Pour‑on formulations – liquid products that are dripped along the spine and rubbed into the coat; effective for medium to heavy infestations. Use the recommended dose, usually 2 ml per 100 kg.
- Injectable systemic agents – ivermectin or doramectin administered subcutaneously; provide lasting protection against multiple ectoparasites. Standard dosage is 0.2 mg/kg body weight.
When applying topical or pour‑on products, isolate the calf to prevent cross‑contamination. Wear protective gloves, coat the animal evenly, and avoid contact with mucous membranes. After treatment, keep the calf in a clean, dry environment for at least 24 hours to allow the insecticide to act.
Repeat the application according to the product’s residual activity, commonly at 7‑ to 10‑day intervals, to interrupt the lice life cycle. Conduct a second inspection after each treatment; if live lice persist, consider increasing the concentration within safe limits or switching to a different class of insecticide.
Integrate non‑chemical measures to reduce reinfestation risk:
- Regular grooming with a fine‑toothed comb removes nits.
- Maintain low humidity and good ventilation in housing.
- Implement a routine cleaning schedule for bedding and equipment.
- Rotate pastures to limit exposure to contaminated environments.
Monitor the calf for adverse reactions such as skin irritation, lethargy, or reduced feed intake. Report any signs to a veterinarian promptly. Document all treatments, dates, and observations to facilitate future management decisions.