Abstract
THE œstrous cycle is but one phase, and the less important phase, of the whole sexual cycle. There are no mammals in which the reproductive phase of the cycle (pseudo-pregnancy) does not also occur—either regularly or under given conditions. But there are some (the primates) in which no œstrous phase appears, since the whole cycle consists of a pseudo-pregnancy. Pseudo-pregnancy depends upon a hormonic function of the ovary, and is entirely independent of the presence of ova, fertilised or unfertilised, mature or immature (Wiesner, 1927). It becomes necessary, therefore, to decide whether pseudo-pregnancy is caused by the same hormone or hormones as that which invokes the œstrous cycle.
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WIESNER, B., PATEL, J. The Beta-Hormone. Nature 123, 449 (1929). https://doi.org/10.1038/123449a0
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DOI: https://doi.org/10.1038/123449a0
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