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450 J. ALTIMIRAS AND L. PHUJOURNAL OF EXPERIMENTAL ZOOLOGY 286:450456 (2000) 2000 WILEY-LISS, INC.
 

Summary: 450 J. ALTIMIRAS AND L. PHUJOURNAL OF EXPERIMENTAL ZOOLOGY 286:450­456 (2000)
© 2000 WILEY-LISS, INC.
JEZ 0704
Lack of Physiological Plasticity in the Early
Chicken Embryo Exposed to Acute Hypoxia
JORDI ALTIMIRAS* AND LINDA PHU
Department of Biological Sciences, University of Nevada, Las Vegas,
Nevada 89154-4004
ABSTRACT By exposing chicken embryos to hypoxia (10%) acutely (2, 4, and 6 hr) during
early development (2, 3, and 4 days) we tested the hypothesis that hypoxia has an impact on
embryonic growth and impairs cardiac development at the time cardiac morphogenesis is taking
place. After the hypoxic perturbation, the embryos were allowed to develop until day 9, when
embryo mass, heart mass, and rate of oxygen consumption were recorded. Four-day-old embryos
exposed to 6 hr of hypoxia showed an increased mortality (38.9% versus 18% for controls), indicat-
ing the immediate effect of hypoxia on survivability. While only 8% of the controls displayed mor-
phological abnormalities, 3- and 4-day-old embryos exposed for 6 hr showed more frequent
developmental abnormalities (25% and 30% respectively). No significant differences in embryo or
heart mass were found except in 4-day-old embryos exposed for 2 hr. Mass-specific oxygen con-
sumption was not different between controls and embryos exposed to hypoxia at 2 or 3 days of
development, but it was increased in 4-day-old embryos exposed for 4 hr (P < 0.05). These results

  

Source: Altimiras, Jordi - Department of Biology, Linköpings Universitet

 

Collections: Environmental Sciences and Ecology