Identity

A critical metabolic condition characterized by severe hyperuricemia. When renal function fails, insoluble monosodium urate crystals precipitate on the serosal surfaces of visceral organs, appearing as a white, chalky coating.

Overview

Visceral Gout is a metabolic consequence of severe renal impairment. Because birds lack uricase, kidney damage prevents uric acid clearance. Aflatoxicosis, Ochratoxicosis, nephrotropic IBV, hatchery dehydration, or Ca:P imbalances (>3:1) can trigger this condition. The crystals coat the heart, liver, and spleen, causing high mortality. Management requires ensuring access to low-salinity water, correcting nutritional imbalances, and administering urinary acidifiers (ammonium chloride) to dissolve renal urate deposits.

Structured Facts

Classification

Metabolic > Non-Infectious

Epidemiology

• Prevalence in India: Critical commercial importance
• Severity: Critical
• Affected Species: Poultry
• Affected Age: Young chicks (1st week, due to dehydration) and mature laying hens (peak lay)
• Transmission: Non-infectious
• Mortality: Up to 80% of clinically affected birds
• Morbidity: 5% to 20%
• Economic Importance: Critical

Clinical Signs

• Early/Intermediate: Depression, ruffled feathers, dehydration, reluctance to move
• Advanced: Sudden death in high-producing layers. Targets Renal and Cardiovascular systems.
• Postmortem Findings: White, chalky, plaster-of-paris-like coating covering pericardium, liver capsule, spleen, and peritoneum. Enlarged pale kidneys distended with white urate deposits.

Diagnosis

• Field Diagnosis: Chalky white deposits on visceral organs
• Laboratory Tests: Urate crystals showing negative birefringence under polarized light microscopy. Histopathology: urate tophi surrounded by giant cells.
• Differential Diagnosis: Colibacillosis (pericarditis/perihepatitis), infectious nephrosis

Treatment

• Immediate Actions: Provide clean, low-salinity drinking water
• Medicines: Urinary acidifiers: Ammonium chloride
• Veterinary Intervention: Guided by SVTG

Prevention

• Vaccination: None
• Biosecurity: Not applicable
• Farm Management: Maintain balanced Ca:P ratio (prevent >3:1); avoid excessive dietary protein; proper feed storage to prevent Aflatoxicosis/Ochratoxicosis

Quantitative Data

• Morbidity Rate: 5% to 20%
• Mortality Rate: Up to 80% (clinically affected)
• Target Age: 1st week, and peak lay
• Dietary Trigger: Ca:P ratio > 3:1
• Ammonium Chloride Dose: 100 to 200 mg/day (orally for a week)

Relationships

• Vaccines: None
• Medicines: Ammonium chloride
• Predisposing Conditions: Aflatoxicosis, Ochratoxicosis, Nephrotropic IBV, Hatchery Dehydration