Possible Factors Controlling Length of Incubation in Birds

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Abstract
Bergtold''s theory that there is an elevation of body temp. and a consequent rise in incubation temp. resulting in a shortening of the length of incubation as the orders of birds are "ascended" has been re-examined in the light of new data. Using published data the coefficient of correlation for egg volume and length of incubation was found to be +0.643, the standard error [plus or minus] 0.0578. It seems therefore that egg size may be one of the most important factors controlling length of incubation.

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