Farm Animal Welfare

Cattle Calf Passive Immunity and Welfare

Failure of passive transfer of maternal antibodies through colostrum is a leading cause of calf mortality and welfare failure in neonatal calves.

Key Facts

Calves are born with essentially no circulating antibodies
Colostrum antibodies must be absorbed within 24 hours of birth
Failure of passive transfer affects approximately 20-30% of dairy calves
Colostrum quality and volume and timing of feeding determine passive transfer success
Testing with a refractometer at 24 hours confirms adequate transfer

Welfare Considerations

Calves with failure of passive transfer are immunologically naive and highly susceptible to septicaemia, diarrhoea, and respiratory disease in the first weeks of life. The suffering of sick neonatal calves is significant and largely preventable through timely, high-quality colostrum feeding. Passive transfer testing provides objective confirmation that calves have received adequate protection.

What You Can Do

Ensure calves receive 4 litres of high-quality colostrum within 6 hours of birth
Test colostrum quality with a Brix refractometer
Implement passive transfer testing at 24 hours as a welfare monitoring tool