Farm Animal Welfare

Cattle Calf Passive Transfer Success

Successful passive transfer of immunity through colostrum is the most important determinant of calf health and welfare in the first weeks of life.

Key Facts

The target is serum IgG above 10 g/L at 24-48 hours of age
Brix refractometry of serum enables simple, inexpensive monitoring
Herds with FPT rates above 20% should review colostrum management protocols
Volume, quality, and timing of colostrum feeding all affect IgG absorption
Pooled colostrum must be pasteurized to prevent pathogen transmission

Welfare Considerations

Calves that achieve successful passive transfer face their first weeks with the immune resources needed to resist infectious challenges. Those with FPT are immunologically naked from birth. The welfare difference between protected and unprotected calves is dramatic - successful transfer prevents repeated disease episodes that cause significant suffering in the critical first weeks.

What You Can Do

Implement routine serum Brix testing to monitor passive transfer success
Target feeding of at least 3 litres of good quality colostrum within 6 hours
Assess and improve colostrum management when FPT rates exceed 20%
Pasteurize pooled colostrum to prevent Johne's disease and salmonella transmission