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Progestogen
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====Placental production==== The role of the placenta in progestogen production varies by species. In the sheep, horse, and human, the [[placenta]] takes over the majority of progestogen production, whereas in other species the corpus luteum remains the primary source of progestogens. In the sheep and human, progesterone is the major placental progestogen. The equine placenta produces a variety of progestogens, primarily [[5Ξ±-dihydroprogesterone]] and [[5Ξ±,20Ξ±-tetrahydroprogesterone]], beginning on day 60. A complete luteo-placental shift occurs by day 120β150.
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