Farm Animal Welfare

Cattle Calf Passive Immunity Welfare

Failure of passive transfer of immunity through colostrum is the single biggest risk factor for calf disease and welfare in the first weeks of life.

Key Facts

Calves are born agammaglobulinaemic - without any antibodies
Colostrum provides IgG that crosses the gut in the first 12 hours
Failure of passive transfer (FPT) is defined as serum IgG below 10 g/L
FPT affects an estimated 20-40% of calves in some herds
Point-of-care tests (Brix refractometry) assess colostrum quality in minutes

Welfare Considerations

Calves with FPT are immunologically naive and highly susceptible to every infectious challenge they face. The first weeks of life become a welfare crisis of repeated disease episodes rather than the healthy start they deserve. Ensuring every calf receives adequate quality colostrum within the first hours of life prevents this fundamental welfare failure at essentially no cost beyond management attention.

What You Can Do

Test colostrum quality with a Brix refractometer before feeding
Ensure every calf receives at least 3 litres of good quality colostrum in the first 6 hours
Supplement or replace poor quality colostrum with stored or commercial alternatives
Monitor calf serum protein to assess passive transfer success at herd level