Abstract
The discovery in 1910 (see Liggins, 1988, for historical review) of the dependence of continuing pregnancy in rodents on the corpus luteum and the subsequent isolation of progesterone seemed to provide a sound basis for the mechanism initiating parturition. The ‘progesterone withdrawal’ hypothesis gained widespread acceptance regardless of whether the maintenance of pregnancy was corpus luteum dependent or placenta dependent. Because the luteotrophic complex of hormones in rodents is of maternal origin, little reason existed to depart from the traditional view that the mechanism resided in the mother rather than the conceptus. However, the 1950s saw increasing awareness of the evidence that fetal genotype in farm animals and certain fetal malformations in both man and farm animals influence the duration of pregnancy. With the unequivocal demonstration in 1967 that hypophysectomy in fetal sheep abolishes the initiation of parturition, the pendulum swung decisively away from maternal control towards fetal control and the fetal endocrine system became the focus of attention of most investigators.
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Liggins, G.C., Thorburn, G.D. (1994). Initiation of Parturition. In: Lamming, G.E. (eds) Marshall’s Physiology of Reproduction. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1286-4_9
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