Abstract
1. 1. Urine was collected using a cloacal cannula. 2. 2. After cannula insertion, pigeons undergo 30–70 min of diuresis and then show a low stable urine flow rate of about 0.4 ml/kg per hr. 3. 3. Urine uric acid concentrations are low during diuresis but show no predictable pattern following diuresis. 4. 4. The percentage of precipitated uric acid in ureteral urine increases approximately linearly to about 90 per cent at 1800 mg % uric acid. 5. 5. Low ionic and colloidal uric acid concentrations support the assumption that uric acid makes little contribution to urine osmotic pressure and that colloidal urates do not account for a large proportion of the uric acid.
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