Downer Cow Syndrome (Recumbent cow syndrome)

- Acknowledgment

We would like to acknowledge the committee of the National Egyptian Guidelines for Veterinary Medical Interventions, Egyptian Health Council for adapting this guideline.

Executive Chief of the Egyptian Health Council: Prof. Mohamed Mustafa Lotief.

Head of the Committee: Prof. Ahmed M Byomi

The rapporteur of the Committee: Prof. Mohamed Mohamedy Ghanem.

Scientific Group Members: Prof. Nabil Yassien, Prof. Ashraf Aldesoky Shamaa, Prof. Amany Abbas, Prof. Dalia Mansour, Dr Essam Sobhy Dr Mohamed Elsharkawy, Prof. Dr Gamal A. Sosa., Dr Naglaa Radwan, Dr Hend El Sheikh

Editor/Author: Prof. Mohamed Ghanem

- Definition

Downer Cow Syndrome (DCS), also known as non‑ambulatory cow or recumbent cow syndrome, describes cattle—usually adult dairy cows—that remain in sternal recumbency for more than 12–24 hours and are unable to rise despite being alert and able to eat and drink. It is most commonly seen in periparturient and early‑lactation cows.

DCS is a major welfare and economic issue, with recovery rates generally below 50% due to progressive muscle and nerve damage.

Economic Impact

Downer cows result in losses from:

• Reduced milk yield
• Veterinary treatment
• Long-term welfare decline
• Cow mortality & culling

- Categories

·        Alert Downer

• Conscious, normal appetite
• Can maintain sternal recumbency
• No major systemic illness

·        Non‑Alert Downer

• Depressed, lethargic, abnormal mentation
• Often indicates systemic infection or neurological disease

- Etiology (Primary Causes)

DCS is the result of a primary issue leading to prolonged recumbency, followed by secondary muscle/nerve damage.

1- Metabolic Causes

·       Hypocalcemia (Milk Fever) – Most common cause, especially periparturient cows.

·       Hypomagnesemia

·       Hypophosphatemia

·       Ketosis (primary & secondary)

·       Fatty liver disease

2- Traumatic / Mechanical Causes

• Calving trauma
• Nerve injuries (sciatic, peroneal, tibial)
• Musculoskeletal injuries
• Falls or slipping

3-. Systemic Illness

• Severe mastitis
• Sepsis
• Toxic

- Pathogenesis

Prolonged recumbency leads to:

4.1. Secondary Injuries

• Ischemic necrosis of large hindquarter muscles
• Peripheral nerve damage due to compression
• Compartment‑like syndromes from intramuscular pressure

The extent of secondary damage strongly predicts survival. Up to 70% can recover if secondary lesions are minimized.

- Clinical Signs

1- General Observations

• Bright, alert demeanor (in "alert downers")
• Normal appetite and rumination
• Persistent sternal recumbency (may attempt to rise)
• Mild to severe reduction in milk yield

2- Neuromuscular Signs

• Inability to bear weight on hindquarters
• Pain responses altered (nerve damage)
• Muscle swelling, stiffness

3- Non‑Alert Signs

• Depression, lethargy
• Systemic illness: fever, tachycardia

Diagnosis of Downer cow

1- Clinical Examination

• Assess mentation (alert vs non‑alert)
• Evaluate limbs for pain, nerve paralysis
• Palpate muscles for swelling or heat

2- Laboratory Diagnostics

• Low calcium, phosphorus, magnesium
• Elevated AST → indicates muscle damage
• Decreased Hb, PCV, RBC
• Elevated WBC → inflammation/infection

These lab findings help diagnose underlying metabolic causes and assess severity.

- Treatment and Management

1- Treatment of Underlying Cause

• Calcium therapy for hypocalcemia
• Magnesium/phosphorus supplementation
• Dextrose/ketosis management
• Antibiotics for infectious causes

2-Supportive Care

Supportive care is critical and often determines outcome:

• Deep, dry bedding to prevent pressure sores
• Frequent repositioning (every 2–3 hours)
• Hip lifters, slings, flotation tanks where available
• Access to water & feed within reach
• Protection from cold/heat stress

3-Physiotherapy

• Passive limb movement
• Massage to increase circulation
• Encouraging attempts to rise (assisted lifting)

- Prognosis

• Recovery rate generally < 50% due to secondary muscle/nerve injury.
• Alert downers have a significantly better prognosis than non‑alert downers.
• Prognosis worsens after >48 hours recumbency.

- Prevention Strategies

1- Nutritional Management

• Balanced calcium–phosphorus ratio
• Prevent negative energy balance
• Avoid over‑conditioning (fat cow syndrome) at periparturient period

2-Calving Management

• Proper assistance
• Avoiding prolonged dystocia
• Post‑partum mineral supplementation

3-Environmental Safety

• Non‑slip floors
• Adequate space
• Clean bedding

4-Early Detection & Intervention

• Prompt treatment of milk fever
• Monitor high‑risk animals (older cows, high producers)

- References

Constable, P. D., Hinchcliff, K. W., Done, S. H., & Grünberg, W. (2017). Veterinary medicine: A textbook of the diseases of cattle, horses, sheep, pigs and goats (11th ed.). Elsevier.

Kumari , A. , Kumar Jain , V. , Kumar Nehra , A. et al. ( 2022 ). Assessment of haematological and biochemical alterations in recumbent buffaloes . Biological Rhythm Research 53 ( 11 ): 1670 – 1691 .

Felix, S.U., Pauline, C.N., Afolabi, M.S., Darma, B.M., Lushaikyaa, A. and Njideka, A. (2024). Downer-cow Syndrome. In Periparturient Diseases of Cattle, T. Rana (Ed.). https://doi.org/10.1002/9781394204007.ch12

Simões, J., Lei, M.C., Stilwell, G. (2025). Downer Cow Syndrome. In: Simões, J. (eds) Encyclopedia of Livestock Medicine for Large Animal and Poultry Production. Springer, Cham. https://doi.org/10.1007/978-3-031-52133-1_317-1