URINARY CREATININE EXCRETION BY MACROPOD MARSUPIALS

1. 1. Urinary creatinine coefficients (mg creatinine excreted/kg per 24 hr) of the tammar wallaby (Macropus eugenii) and the hill kangaroo (Macropus robustus) were measured. The values are 21·6 and 12·7 respectively. 2. 2. Statistical analysis showed no significant differences between animals fed high or low protein diets nor was there a significant correlation between creatinine excretion and urine flow. 3. 3. Creatinine coefficients were compared on a weight basis with values for eutherian mammals and were found to be half those of the eutherians. 4. 4. The findings are consistent with previous work which implies that the nitrogen metabolism of macropod macropod marsupials is depressed compared with eutherians. © 1969.