Dairy Cow Milk Fever Prevention and Welfare

Milk fever — hypocalcemia at calving — is a painful and life-threatening condition in dairy cows that is largely preventable with proper prepartum nutrition management.

Key Facts

Milk fever affects 5-10 percent of dairy cows with some herds experiencing rates of 20-30 percent
The condition results from the sudden calcium demand of milk production overwhelming the cow ability to mobilize calcium
Subclinical hypocalcemia — blood calcium below normal without obvious clinical signs — affects up to 50 percent of cows
Both clinical and subclinical hypocalcemia significantly impair subsequent fertility, immune function, and production
Cows with milk fever are unable to stand and are fully conscious of their inability to rise — a profoundly distressing state
Prepartum dietary anion supplementation (DCAD) effectively prevents milk fever in most herds
Oral calcium supplementation at calving reduces subclinical hypocalcemia in high-risk cows
Early and effective treatment with intravenous calcium restores normal function rapidly — delayed treatment increases welfare harm

Welfare Considerations

Milk fever represents a preventable welfare crisis that affects a significant proportion of dairy cows globally. A cow unable to rise while fully conscious experiences profound distress, physical discomfort, and vulnerability — and the subclinical form that affects many more cows without obvious clinical signs still causes significant immunological and metabolic harm that impairs long-term wellbeing. The condition is well understood, and prevention through DCAD prepartum nutrition is effective and widely applicable. The gap between achievable and actual milk fever rates in many herds represents preventable suffering that proper nutritional management could eliminate. Early detection and prompt treatment when prevention fails are minimum welfare standards.

What You Can Do

Implement DCAD prepartum nutrition programs with herd veterinarian guidance to prevent milk fever
Monitor transition cow calcium status using serum or urine pH testing around calving
Administer oral calcium at calving to high-risk cows — older cows and high-production breeds
Establish monitoring systems to detect cows slow to rise after calving for prompt treatment
Train farm staff to recognize milk fever signs and respond with immediate intravenous calcium treatment
Track herd milk fever incidence and set improvement targets with your herd veterinarian