Bovine Metabolic Disease: Deep Welfare Analysis

A comprehensive welfare analysis of metabolic diseases in dairy cattle — ketosis, fatty liver, milk fever, and grass tetany — and their cumulative burden on high-producing cows.

Key Facts

Metabolic diseases in dairy cattle result from the extreme nutritional demands of high milk production — they cluster in the periparturient period and represent a systemic welfare challenge in modern dairy.
Subclinical ketosis affects 25-50% of dairy cows in early lactation — affected cows have negative energy balance, elevated BHBA, reduced feed intake, and a 3-5x increased risk of other diseases.
Clinical ketosis (ketonaemia) causes inappetence, weight loss, acetone breath, and milk drop — in severe cases, nervous ketosis causes ataxia and behavioral changes.
Hepatic lipidosis (fatty liver) occurs secondary to severe NEB — cows mobilize fat stores faster than the liver can process, leading to hepatic dysfunction and immune suppression.
Hypocalcaemia (milk fever) at calving causes muscle weakness, inability to rise, and death if untreated — subclinical hypocalcaemia without these dramatic signs is far more common and impairs immune function.
Grass tetany (hypomagnesaemia) in grazing cows causes convulsions and rapid death if untreated — it is particularly common in spring when grass is lush and low in magnesium.
Prevention through dry cow nutrition management (DCAD diets, mineral supplementation) is more effective than treatment — every metabolic disease case represents a welfare failure that good dry cow management could prevent.

Welfare Considerations

Metabolic diseases represent the accumulated welfare cost of pushing dairy cows to extreme production levels. Each case of ketosis, milk fever, or fatty liver is a welfare event that causes real suffering and often shortens productive life. Prevention-focused dry cow management, appropriate production targets, and breed selection for metabolic robustness are the paths to meaningful welfare improvement in dairy systems.

What You Can Do

Advocate for herd management consultations that prioritize dry cow nutrition and metabolic disease prevention
Support selection for metabolic robustness in dairy breed programs, not only milk yield
Choose Pasture for Life or Organic dairy products from systems with lower production pressure on cows
Donate to Farm Animal Welfare Council research on metabolic disease prevention in dairy systems