Fig. 5

Xanthinuria in a six-month-old Tyrolean Grey heifer. Note the presence of stones visible as diffused mineralization in the granular sandy yellow mass in the urinary bladder (a) and kidney (b) of case 3 showing uroliths (c+d). Quantitative mineral analysis by FT-IR spectroscopy of a kidney stone demonstrated a greater than 95% xanthine content (e)