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Urinary Calculi is the formation of crystals or stones in the urinary tract which block the elimination of urine from the body.(These are commonly referred to as Kidney Stones in humans.) Most often these crystals are formed due to a metabolic imbalance in the body caused by feeding too much grain to bucks and wethers.rinary Calculi is the formation of crystals or stones in the urinary tract which block the elimination of urine from the body.
Types. Calculi in the urinary system are called urinary calculi and include kidney stones (also called renal calculi or nephroliths) and bladder stones (also called vesical calculi or cystoliths). They can have any of several compositions, including mixed. Principal compositions include oxalate and urate.