Metabolic Disease in Cattle: Integrated Welfare Management
The Metabolic Disease Complex
Metabolic diseases in dairy cattle — ketosis, milk fever, fatty liver, displaced abomasum, and grass tetany — are interrelated conditions arising from nutritional and metabolic imbalances, primarily around calving. They share risk factors: high milk production genetic potential, inadequate transition management, and nutritional deficiencies. Prevention of one often reduces risk of others. Collectively they cause significant suffering and economic loss.
Ketosis Welfare Impact
Subclinical ketosis (elevated blood or milk BHBA without overt clinical signs) affects 20-40% of cows in the first 2 weeks of lactation. Clinical ketosis (type I and II) causes anorexia, reduced milk production, weight loss, lethargy, and neurological signs (acetonaemia — sweet ketone smell, staggering). The relationship between ketosis and other transition diseases means ketotic cows are at significantly higher risk of mastitis, metritis, and displaced abomasum — compounding welfare impact.
Monitoring Protocols
Systematic metabolic monitoring programmes identify at-risk animals before clinical signs develop. Weekly blood BHBA measurement of a sample of fresh cows (5-10 per week) estimates herd prevalence. Milk ketone testing (MilkoCan, Keto-Test) allows cow-side testing. Body condition scoring at drying off and calving identifies over-conditioned cows at high risk. Urine pH monitoring (DCAD management) assesses transition diet effectiveness. Data from monitoring guides nutritional and management adjustments.
Preventive Nutritional Management
Key nutritional interventions: controlled energy feeding in the dry period (preventing over-conditioning); negative DCAD diets in the close-up period (calcium mobilisation); magnesium supplementation (essential for calcium metabolism); oral calcium supplementation at calving for high-risk cows; propylene glycol supplementation for cows at high ketosis risk; and ensuring adequate vitamin E and selenium status (supporting immune function and uterine health). A detailed transition cow programme, developed with the herd vet and nutritionist, is the foundation.
Farm-Level Implementation
Implementing metabolic disease prevention requires: clear dry cow and transition cow protocols agreed with the herd vet and nutritionist; consistent application by farm staff; systematic recording and monitoring of metabolic disease incidence; and regular review of outcomes. Farms with higher metabolic disease rates than benchmarks should investigate root causes. Staff training in recognising metabolic disease signs and applying treatment protocols promptly is an essential welfare investment.