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** The closeness with which the 'brood patch' is applied to the egg.
 
** The closeness with which the 'brood patch' is applied to the egg.
 
** Responding physiologically to the temperature of the egg, thus increasing or decreasing metabolic heat production.
 
** Responding physiologically to the temperature of the egg, thus increasing or decreasing metabolic heat production.
* 'Brood patch temperature is 34.9-42.4
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* 'Brood patch' temperature is 34.9-42.4ºC.
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** This is 1.1-5.5ºC higher than the egg temperature.
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* Heat loss from the egg is prevented by a thin boundary layer of air adjacent to the shell.
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* If the egg is in a nest, the nest will also provide resistance to heat loss.
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== Development of Physiological Functions ==
 
== Development of Physiological Functions ==
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