Experimental XXXX in the ring-necked @entity4186 .

@entity4186 @entity137 @entity73106 @entity294 @entity7888 @entity8454 @entity2055
Ring-necked @entity4186 (Aythya collaris) were administered a single lead shot by gastric intubation. At weekly intervals over a 7-week period, the birds were weighed and blood samples obtained for measurement of hematocrit, free erythrocyte @entity7888 (FEP), blood lead and @entity8454 dehydratase (delta- @entity73106 ) activity. The birds were fluoroscoped weekly to ensure that the pellets had been retained. Blood lead concentrations peaked 1 week after dosing at a concentration of 7.75 micrograms/ml and then fell to control levels by Week 4. FEP concentrations in the treated @entity4186 also peaked 1 week after dosing at levels which were roughly 1200% of control concentrations. The return of FEP concentrations to normal paralleled blood lead. @entity73106 activity was inhibited by approximately 85% by Week 1; however, there was a gradual but steady recovery of @entity73106 activity through Week 7. Four of the treated birds died within 2 to 3 weeks of lead administration. Physical signs of @entity137 were maximal 7 to 10 days postdosing and included @entity2055 , loss of body weight, impaction of the upper gastrointestinal tract, and bile green @entity294 . In surviving birds, overt signs of @entity137 declined with time and all birds appeared normal by Week 7.
