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Artykuły w czasopismach na temat "Pic préovulatoire de l’hormone lutéinisante"
Zongo, Moussa, W. Pitala, Laya Sawadogo, Hamidou Boly, N. Melo de Sousa, J. Sulon i J. F. Beckers. "Concentrations de l’hormone lutéinisante et de la progestérone chez des vaches zébus Azawak soumises à différents protocoles de synchronisation de l’oestrus". Revue d’élevage et de médecine vétérinaire des pays tropicaux 61, nr 3-4 (1.03.2008): 221. http://dx.doi.org/10.19182/remvt.9993.
Pełny tekst źródłaIssa, M., Hamani Marichatou, A. Yenikoye i M. Banoin. "Paramètres de l'endocrinologie sexuelle des béliers Peuls et Touaregs : influence du type génétique et de la saison". Revue d’élevage et de médecine vétérinaire des pays tropicaux 59, nr 1-4 (1.01.2006): 75. http://dx.doi.org/10.19182/remvt.9958.
Pełny tekst źródłaRozprawy doktorskie na temat "Pic préovulatoire de l’hormone lutéinisante"
Simonneaux, Marine. "Évaluation de l’impact de la perturbation du rythme circadien sur la fonction de reproduction des mammifères femelles". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAJ096.
Pełny tekst źródłaIn female mammals, optimal fertility relies on the synchronization of neuroendocrine and behavioral events regulating reproductive function. To this end, the circadian timing system, entrained by the light-dark cycle, sets the pace for the hypothalamic-pituitary-ovarian axis. Therefore, irregular light-dark cycles, such as those experienced in shift work, can disrupt reproductive function and compromise fertility, especially in women. This research aimed to assess the effects of circadian disruption on female reproductive function and investigate the underlying neuroendocrine mechanisms. In female mice, exposure to a light-based shift work model led to a major desynchronization of the preovulatory LH surge, which persisted for several weeks. This disruption was associated with altered transmission of daily signals from the master circadian clock to kisspeptin neurons, which regulate LH secretion. Additionally, reproductive outcomes in mice were affected, though without any major impact on offspring development
Freitas, Vicente José De Figueiredo. "Etude des facteurs responsables de la variabilité du moment d'apparition de l'oestrus et du pic préovulatoire de LH après traitement hormonal de synchronisation et/ou induction de l'oestrus chez la chèvre". Tours, 1996. http://www.theses.fr/1996TOUR4022.
Pełny tekst źródłaBen, Said Samia. "Etude de la sensibilité différentielle de l'hypothalamus à l'œstradiol pour induire le pic préovulatoire de LH et le comportement sexuel : comparaison entre Brebis Ile-de-France et Romanov". Thesis, Tours, 2009. http://www.theses.fr/2009TOUR4006/document.
Pełny tekst źródłaUsing an artificial follicular phase model, the minimum estradiol (E) requirement to induce the preovulatory LH surge and estrous behaviour, was compared between two breeds of ewes having either single (Ile de France= IF) or multiple (Romanov= ROM) ovulations. While a small E signal is sufficient to induce estrous behaviour, in ROM ewe, the same treatment has no effect on IF ewe. A much larger amount of E is required to induce the LH surge in the ROM compared to the IF. The onset of the LH surge occurred earlier in IF. Pituitary and hypothalamic sensitivity to E were studied in vivo and in vitro. The timing of the LH surge is essentially under the control of the hypothalamus. The latency to the onset of the LH surge is timed by a negative feedback effect of E at the hypothalamic level which is longer in ROM ewes. A moderate E signal stimulates a light GnRH secretion into the cerebrospinal fluid, which was not accompanied by a parallel pituitary LH discharge. GnRH appears involved in the control of estrous behaviour. The difference in sensitivity to E between IF and ROM ewes to induce LH surge and estrous behaviour is more than likely due to a different threshold in the lecture of the E signal