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Evolution de la progestérone plasmatique chez la femelle Vipera berus L. (Reptilia: Viperidae) au cours du cycle sexuel

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, In pregnant female Vipera berus, body weight increases slightly during the pregnancy. Parturition induces an average weight loss of 40 % . Plasma progesterone is high in July and decreases until September. The level of this hormone increases at the beginning of hibernation. A female which did not complete its gestation showed a rapid decrease of progesterone in July and, as with other gestating females that had given birth, a rise in November. In a nonpregnant female, the profile of plasma progesterone showed a peak in August. The control of progestrone in the sexual cycle is discussed.

Affiliations: 1: Centre d'Etudes Biologiques des Animaux Sauvages, Villiers-en-Bois, 7360 Beauvoir-s-Niort, France


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