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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.
Prostatic calculi are classified as exogenous or endogenous, depending on the point of origin. Exogenous calculi come from urinary salts and may originate as ureteral or bladder stones and become lodged in the prostatic urethra. In a sense they are not true prostatic stones, but they have been classed as such.