Abstract   

Wide spread problem of urolithiasis in broiler breeders and commercial layers associated with high mortality and loss of condition was investigated. Calcium and phosphorus were high in feed as well as in drinking water. Virus as a cause of urolithiasis was not ascertained. On postmortem, birds revealed visceral gout, atrophy and or hypertrophy of the kidneys. One or both ureters were packed with white uroliths figuring out as white cords. Microscopically, urate deposits along with necrosis and loss of kidney parenchyma were the predominant lesions.