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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.
urinary calculus, a mineral concretion formed in any part of the urinary tract. Calculi may be large enough to obstruct the flow of urine or small enough to be passed with the urine. Calculi can originate in either the kidneys or the bladder.Kinds of urinary calculi are renal calculus and vesical calculus.See also calculus. mineral concretion formed in any part of the urinary tract. Calculi may be large enough to obstruct the flow of urine or small enough to be passed with the urine. Calculi can originate in either the kidneys or the bladder. Kinds of urinary calculi are renal calculus and vesical calculus. See also calculus.