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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 tract anatomy. The urinary tract consists of two kidneys, two ureters, a urinary bladder, and a urethra. The kidneys filter your blood and remove water and waste through the urine. The urine travels from the kidney to the bladder through tubes called ureters. The urine is stored in the urinary bladder, and then moves through the urethra to be passed out of the body when you urinate.