Bovine leptospirosis causes reproductive failure, milk drop syndrome, and systemic illness in cattle. Welfare-conscious management combines vaccination, hygiene, and biosecurity.
The welfare burden of leptospirosis falls disproportionately on dairy cattle. Acute milk drop syndrome can reduce yield by 50% within days, and affected cows show systemic illness including fever, inappetence, and depression. The haemolytic anaemia in severe cases causes significant suffering and can be fatal.
Chronic reproductive effects — repeated abortions and stillbirths — cause distress to affected cows and represent a prolonged welfare problem. Cows experiencing recurrent pregnancy loss may develop behavioral signs of distress, and the repeated loss of calves compounds welfare impact over successive lactations.
Vaccination is highly effective and is the cornerstone of leptospirosis control in cattle. Annual vaccination maintains protection and significantly reduces urinary shedding, protecting both the herd and farm workers. Environmental hygiene — managing wet areas, controlling rodent populations, and preventing access to standing water — reduces transmission risk.