Hypoxia and the Development of Endothermic Capacity in Chickens (Gallus Gallus)

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Adult chickens employ endothermy – internal generation of heat that maintains a constant body temperature (Tb). Prior to hatching, chicken embryos are ectothermic - controlling Tb by external heat sources. Upon hatching, the hatchling transitions from an ectotherm to an endotherm that has been shown to be delayed by hypoxia. In this study, whole animal oxygen consumption () and liver, heart, and skeletal muscle citrate synthase activity (CSA) and were measured during this transition to endothermy in chickens incubated in normoxia and hypoxia (15% O2). The only significant differences in occurred in 48 hour old hatchlings where was lower in ... continued below

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Neely, Aaron Mackallan August 2012.

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  • Neely, Aaron Mackallan

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Adult chickens employ endothermy – internal generation of heat that maintains a constant body temperature (Tb). Prior to hatching, chicken embryos are ectothermic - controlling Tb by external heat sources. Upon hatching, the hatchling transitions from an ectotherm to an endotherm that has been shown to be delayed by hypoxia. In this study, whole animal oxygen consumption () and liver, heart, and skeletal muscle citrate synthase activity (CSA) and were measured during this transition to endothermy in chickens incubated in normoxia and hypoxia (15% O2). The only significant differences in occurred in 48 hour old hatchlings where was lower in normoxic hatchlings. There were no differences in CS activity between age and incubation oxygen levels. Additionally, preliminary 2-D protein gels of embryo and hatchling liver show changes in the proteome upon hatching. Results suggest that hypoxia had no significant effect on CSA and a minimal effect on .

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  • August 2012

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  • March 4, 2013, 2:02 p.m.

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  • Nov. 16, 2016, 3:47 p.m.

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Neely, Aaron Mackallan. Hypoxia and the Development of Endothermic Capacity in Chickens (Gallus Gallus), thesis, August 2012; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc149643/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .