Cattle Welfare and External Parasite Management

Lice infestations cause significant welfare compromise in housed cattle during winter, with effective prevention and treatment strategies available.

Key Facts

Lice infestations peak in winter when cattle are housed and light intensity is reduced
Both sucking and biting lice species affect cattle — sucking lice cause direct blood loss
Heavy infestations cause intense pruritus, rubbing, restlessness, and weight loss
Pour-on ivermectin and cypermethrin products provide effective treatment
Overcrowding and poor nutrition increase susceptibility to lice buildup in housed herds

Welfare Considerations

Cattle lice cause chronic welfare compromise through persistent pruritus leading to restlessness, impaired lying behaviour, and reduced feed intake. Heavy infestations may cause anaemia in young stock. The welfare impact is often underestimated because cattle cannot vocalise their discomfort clearly. Regular body condition scoring and examination of neck and back areas during winter housing enables early detection. Treatment is inexpensive and highly effective, making delayed treatment particularly unjustifiable on welfare grounds.

What You Can Do

Include routine lice assessment in winter housing health checks for housed cattle
Treat infested animals promptly with appropriate pour-on or injectable parasiticides
Address nutritional and housing density risk factors that predispose to lice buildup
Advocate for external parasite management to be included in winter cattle welfare audit checklists