Displaced Abomasum in Dairy Cows: Welfare Management

Displaced Abomasum and Dairy Welfare

Left displaced abomasum (LDA) is one of the most common surgical conditions of dairy cows, occurring most frequently in the first few weeks after calving. The abomasum (true stomach) becomes filled with gas and moves to an abnormal position, causing pain, reduced feed intake, and systemic effects that significantly compromise welfare.

Pathophysiology

LDA typically develops when the abomasum becomes hypomotile (slowed movement) during the periparturient period due to metabolic disease (hypocalcaemia, ketosis), displaced rumen position after calving, or low-fibre diets. Gas accumulates and the organ floats to the left side of the abdomen.

Welfare Impacts

• Reduced appetite: LDA cows show marked reduction in dry matter intake, exacerbating negative energy balance and metabolic stress.
• Pain: The displacement causes abdominal discomfort, often manifesting as mild to moderate pain signs.
• Secondary conditions: LDA is frequently associated with concurrent ketosis, milk fever, and fatty liver — compounding welfare harm.
• Production loss: Significant milk yield reduction during and after the displacement episode.
• Systemic effects: Dehydration, electrolyte imbalances, and metabolic acidosis in untreated cases.

Diagnosis

• Characteristic 'ping' sound on simultaneous percussion and auscultation of the left flank
• History of recent calving, reduced milk yield, and reduced feed intake
• Concurrent metabolic disease common
• Differential diagnosis: bloat, vagal indigestion, peritonitis

Treatment Options

• Surgical correction: Toggle suture (roll and pin), right flank omentopexy, or left flank laparotomy are the main techniques. Surgical success rates are high with prompt intervention.
• Rolling: Non-surgical manipulation; high recurrence rate — generally not recommended for welfare reasons.
• Supportive care: IV fluids, glucose, calcium, and treatment of concurrent ketosis alongside surgical correction.
• NSAIDs: Analgesia should accompany surgical intervention for welfare.

Prevention

• Maximising dry matter intake in transition cows (3 weeks before calving)
• Adequate effective fibre in the transition diet
• Body condition score management to prevent over-fat dry cows
• Management of concurrent metabolic diseases (hypocalcaemia, ketosis)
• Minimising stress around calving

Key Takeaways

Displaced abomasum is a preventable welfare condition in dairy cows. Prompt surgical intervention combined with appropriate analgesia and management of concurrent metabolic disease optimises welfare outcomes. Prevention through transition cow management is far preferable to treatment.