Abstract
Summary
The ADH concentration in plasma of cetacea was measured following a period of fasting from 2.5 to 60 hr. Although the urine flow rate decreased markedly with longer periods of fasting, it was not possible to demonstrate a correlation between urine flow rate and ADH concentration of plasma. This was due to the fact that all animals had either very low or undetectable concentrations of ADH in plasma. In addition, the amount of ADH in two porpoise pituitaries was considerably lower, on a body weight basis, than in rats. It was concluded that it is unlikely that ADH plays any significant role in regulating urine volume in the porpoise.
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