Abstract
Compared to adults, the oxygen affinity of blood from fetalSphenomorphus quoyii is very much higher:P50 is approximately 70 Torr in adults and 30 Torr in nearly full term embryos\((P_{CO_2 } = 17 Torr, T = 34 ^\circ C)\). Following birth, oxygen affinity decreases gradually and adult values are approached after about 15 weeks, with the onset of winter retreat. Electrophoresis revealed a multiple hemoglobin system in both adults and embryos, but there were no apparent differences between them.
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