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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.
The term is derived from the Greek words sialon (saliva) and lithos (stone), and the Latin-iasis meaning process or morbid condition. A calculus (plural calculi) is a hard, stone-like concretion that forms within an organ or duct inside the body.