Egg Incubation Physiology - Anatomy & Physiology

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Changes in Composition of the Egg during Incubation

  • As the embryo grows within the egg, the composition of the egg changes.
  • Both yolk and albumin diminish.
    • Yolk providing energy for growth and maintenance of the embryo.
    • Albumin providing protein for the embryo and giving up water, which is lost through pores in the shell.
  • Water is produced when yolk fat is oxidised.
  • Water lost from the egg is replaced by air, creating the 'air cell' at the blunt end of the egg.
  • Embryo punctures the chrioallantoic and internal shell membrane.
    • Able to begin pulmonary ventilation, rebreathing the 'air cell' gas.
    • Transition from diffusive respiration through the chorioallantois to breathing through the lungs.

Heat Transfer to the Egg

Development of Physiological Functions