Abstract
1. 1. Glucose uptake values for European starling ( Sturnus vulgaris) hearts in vitro are comparable to values from rat, mouse, and bat hearts. 2. 2. The efficiency of glucose utilization (beats/μmole glucose/gdw), however, was higher in the starling than in bat and mouse hearts. 3. 3. Lactate production was lower than values reported for mouse, bat, and rat hearts. 4. 4. Increased glucose utilization coupled with low lactic acid production might reflect a more efficient system for metabolizing glucose. 5. 5. Glycogen values from perfused hearts showed a nonsignificant change during the hour perfusion when compared with those from nonperfused hearts.
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