Tick Control in Cattle: Welfare and Management
Welfare Impact of Tick Infestation
Heavy tick burdens cause significant welfare harm. Blood loss from large infestations causes anaemia, weakness, and reduced productivity. Tick bites are irritating and painful; heavily infested cattle show tick worry behaviour (restlessness, self-grooming, reduced feeding time). Secondary infection at bite sites causes lesions. More seriously, ticks transmit diseases causing severe illness and death: babesiosis (redwater), theileriosis, anaplasmosis, and Lyme disease.
Tick-Borne Diseases and Welfare
Babesiosis (Babesia divergens/bovis) causes haemolytic anaemia, haemoglobinuria (red urine), fever, and death if untreated. Theileriosis causes lymph node swelling, fever, and respiratory distress. Louping ill (tick-borne encephalomyelitis) primarily affects sheep but also cattle and wildlife. Each disease causes significant acute suffering; early treatment is essential. Reporting tick-borne disease to APHA ensures appropriate surveillance.
Acaricide Treatment
Topical acaricides (pour-on or spray formulations: cypermethrin, deltamethrin, flumethrin) are the mainstay of tick control. Application frequency and timing depend on tick species, season, and local pressure. Resistance to synthetic pyrethroids is emerging in some areas; rotation of actives or use of organophosphates (where licensed) manages resistance. Correct application technique ensures efficacy and prevents under-dosing.
Non-Chemical Control Strategies
Integrated tick management reduces reliance on chemical treatment: pasture management (removing tick habitat — bracken, long grass, woodland edges — from grazed areas); rotational grazing (pasture resting allows tick populations to decline); breed selection (Bos indicus breeds show greater natural tick resistance than Bos taurus); and biological control (some predatory insects reduce tick populations). Combining non-chemical with targeted chemical use reduces resistance development.
Monitoring and Record-Keeping
Regular inspection of cattle for tick burden (particularly around ears, axillae, groin, and tail head where ticks preferentially attach) allows early detection of infestation and prompt treatment. Recording tick-borne disease incidents guides timing of preventive treatment. Farm health plans should include a tick risk assessment and agreed management strategy developed with the herd vet.