Cycles in the Prenatal Growth of the Domestic Fowl

Abstract
In general, fluctuations in growth are not accidental and not the result of experimental error, but are oscillations caused by normal chemical and physiological processes in the course of prenatal development. There are at least 3 well distinguished cycles in the growth of the fowl embryo. Retardation of growth usually falls within a definite age period of the embryo, that is, at 9 and 16 days of incubation.

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