Livestock Welfare

Displaced Abomasum in Dairy Cattle: Welfare Priority

Managing left displaced abomasum in dairy cows — a common periparturient condition requiring prompt intervention.

Key Facts

Abomasal displacement (primarily left displacement, LDA) occurs most commonly within 6 weeks of calving
It causes reduced feed intake, lethargy, decreased milk production, and ketosis
Risk factors include overcrowding, inadequate transition nutrition, and poor cow comfort
Diagnosis is confirmed by the characteristic ping sound on percussion of the left flank
Surgical or roll-and-toggle correction is required — medical management alone is insufficient

Welfare Considerations

Displaced abomasum causes significant welfare impairment through reduced feed intake and secondary metabolic disease. Cows with LDA are uncomfortable — the gas-filled abomasum causes abdominal discomfort, reduces rumen fill, and impairs normal rumination. Reduced feed intake accelerates negative energy balance in the critical periparturient period, causing or worsening ketosis.

The welfare of uncorrected LDA progressively deteriorates. Without correction, cows continue in negative energy balance, lose body condition, produce significantly reduced milk yields, and remain uncomfortable. Secondary ketosis causes neurological signs (acetonaemia/grass staggers) in severe cases. Prompt surgical or conservative correction significantly improves welfare.

Prevention is primarily nutritional — the transition period (3 weeks pre- to 3 weeks post-calving) determines abomasal displacement risk. Maximising dry matter intake before calving, avoiding over-conditioning, ensuring adequate fibre in transition diets, and minimising post-calving dietary changes all reduce LDA incidence.

What You Can Do

Implement excellent transition cow management to reduce LDA risk
Score cows for body condition pre-calving — avoid over-fat cows entering the dry period
Provide adequate trough space and feed push-up frequency to maximise transition cow intakes
Seek veterinary assessment for any cow showing reduced appetite and production within 6 weeks of calving
Correct LDA promptly — delayed treatment worsens welfare and prognosis