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Urinary Calculi in Male Sheep: Welfare Emergency

Urinary calculi (urolithiasis) is a painful and life-threatening emergency in male sheep. This guide covers welfare-centred recognition and management.

Key Facts

Urinary calculi form when mineral crystals precipitate in the urinary tract
Male sheep are particularly at risk due to their long, narrow urethra
Obstruction causes severe pain, straining, and bladder rupture if untreated
High-concentrate diets are a major risk factor, especially with imbalanced Ca:P ratios
Amputation of the urethral process may provide temporary relief
Prevention through dietary management is most effective

Welfare Considerations and Management

Welfare-centred management of urinary calculi requires immediate veterinary attention. Urethral obstruction causes extreme pain and rapid deterioration. Amputation of the urethral process may relieve obstruction in early cases. Perineal urethrostomy provides longer-term relief but carries risks in fattening lambs. Prevention through correct Ca:P ratios in the diet, adequate water access, salt supplementation to increase water intake, and avoiding excessive concentrate feeding is most effective.

What You Can Do

Ensure correct calcium to phosphorus ratio (2:1) in sheep diets
Provide ad libitum clean water to reduce mineral concentration in urine
Seek immediate veterinary attention if any male sheep strains to urinate
Add salt to diets to encourage water intake in high-risk animals