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− | <big><center>[[Reproductive System|'''BACK TO REPRODUCTIVE SYSTEM''']]</center></big>
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− | <big><center>[[Reproductive_System#Exotics|'''BACK TO EXOTICS''']]</center></big>
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− | <big><center>[[Exotics_-_Avian_Reproductive_Anatomy_and_Physiology_-_Anatomy_%26_Physiology|'''BACK TO AVIAN REPRODUCTIVE ANATOMY & PHYSIOLOGY''']]</center></big>
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| == Changes in Composition of the Egg during Incubation == | | == Changes in Composition of the Egg during Incubation == |
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| *As the embryo grows within the egg, the composition of the egg changes. | | *As the embryo grows within the egg, the composition of the egg changes. |
− | * Both yolk and albumin diminish. | + | * Both [[Egg Composition and Formation - Anatomy & Physiology#Yolk|yolk]] and albumin diminish. |
| ** Yolk providing energy for growth and maintenance of the embryo. | | ** 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. | + | ** Albumin providing protein for the embryo and giving up water, which is lost through pores in the [[Egg Composition and Formation - Anatomy & Physiology#Shell|shell]]. |
| * Water is produced when yolk fat is oxidised. | | * 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. | | * 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. | + | * Embryo punctures the [[Egg Composition and Formation - Anatomy & Physiology#Embryonic_Membranes|chorioallantoic]] and [[Egg Composition and Formation - Anatomy & Physiology#Shell_membranes|internal shell membrane]]. |
| ** Able to begin pulmonary ventilation, rebreathing the 'air cell' gas. | | ** Able to begin pulmonary ventilation, rebreathing the 'air cell' gas. |
− | ** Transition from diffusive respiration through the chorioallantois to breathing through the lungs. | + | ** Transition from diffusive respiration through the [[Egg Composition and Formation - Anatomy & Physiology#Embryonic_Membranes|chorioallantois]] to breathing through the [[Lungs_- Anatomy & Physiology|lungs]]. |
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| == Heat Transfer to the Egg == | | == Heat Transfer to the Egg == |
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| + | === Heat Transfer to the Egg === |
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| * Transfer of heat from the body to the egg is the most important contribution of the incubating adult to incubation. | | * Transfer of heat from the body to the egg is the most important contribution of the incubating adult to incubation. |
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| ** This is 1.1-5.5ºC higher than the egg temperature. | | ** This is 1.1-5.5ºC higher than the egg temperature. |
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| + | === Heat Loss from the Egg === |
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− | * Heat loss from the egg is prevented by a thin boundary layer of air adjacent to the shell. | + | * Heat loss from the egg is prevented by a thin boundary layer of air adjacent to the [[Egg Composition and Formation - Anatomy & Physiology#Shell|shell]]. |
| * If the egg is in a nest, the nest will also provide resistance to heat loss. | | * If the egg is in a nest, the nest will also provide resistance to heat loss. |
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| + | [[Category:Avian Reproduction]] |
| + | [[Category:Bullet Points]] |