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- W2000427291 abstract "During the non-breeding season, anestrous ewes do not experience ovarian cycles but exposure to a ram or its odor results in the activation of the luteinizing hormone secretion leading to ovulation. The aim of our work was to identify the neural pathways involved in this phenomenon. Using Fos immunocytochemistry, we examined the brain areas activated by the male or its fleece, in comparison with ewes exposed to the female fleece or the testing room (control group). In comparison with the control group, the male or its odor significantly increases Fos neuronal expression in the main and accessory olfactory bulbs, anterior olfactory nucleus, cortical and basal amygdala, dentate gyrus, ventromedial nucleus of the hypothalamus, piriform and orbitofrontal cortices. The main olfactory bulb, the cortical amygdala and the dentate gyrus are specifically more activated by the male odor than the female odor. Using a procedure of double labeling for Fos and gonadotropin-releasing hormone, we also compared the number of gonadotropin-releasing hormone neurons activated in the four groups of females. The male or its odor significantly increases the number and the proportion of gonadotropin-releasing hormone cells expressing Fos-immunoreactivity in the preoptic area and the organum vasculosum of the lamina terminalis, whereas no such induction of Fos-immunoreactivity was found in gonadotropin-releasing hormone neurons of ewes exposed to the female odor or the testing room. These findings emphasize the role of the main olfactory system in the detection and the integration of the ram odor, and also suggest the participation of the accessory olfactory system. Numerous structures widely distributed seem involved in the processing of the male olfactory cue to reach the gonadotropin-releasing hormone neurons." @default.
- W2000427291 created "2016-06-24" @default.
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- W2000427291 date "2006-01-01" @default.
- W2000427291 modified "2023-10-18" @default.
- W2000427291 title "Neural pathways involved in the endocrine response of anestrous ewes to the male or its odor" @default.
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- W2000427291 doi "https://doi.org/10.1016/j.neuroscience.2006.02.066" @default.
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