Hypothalamic-pituitary-gonadal axis response to photoperiod changes in female guanacos (<i>Lama guanicoe</i>)

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dc.contributor.authorCorrea, Lina Maria
dc.contributor.authorMoreno, Ricardo D.
dc.contributor.authorRiveros, Jos e Luis
dc.date.accessioned2025-01-20T17:08:47Z
dc.date.available2025-01-20T17:08:47Z
dc.date.issued2024
dc.description.abstractThe guanaco, a wild South American camelid, is renowned for its remarkable resilience to extreme conditions. Despite this, little is known about how reproductive hormones in female camelids are influenced during their seasonal breeding period, which occurs during long photoperiod. To explore this, the study investigated the response of the hypothalamic-pituitary-gonadal axis in female guanacos during short days (10L:14D; July) and long days (16L:8D; December) in the Mediterranean ecosystem (33(degrees)38 ' 28 '' S, 70(degrees)34 ' 27 '' W). Blood samples from 14 adult animals were collected, and measurements of melatonin, 178-estradiol, FSH, and LH concentrations were taken. The results showed that melatonin concentration was lower (P < 0.05) during long days than short days, whereas 178-estradiol, FSH, and LH concentrations were higher (P < 0.05) during long days compared to short days. Furthermore, the study detected the expression of the melatonin receptor 1A and kisspeptin in the hypothalamus and pituitary, suggesting that the pineal gland of female guanacos is sensitive to seasonal changes in day length. These findings also indicate a seasonal variation in the concentration of reproductive hormones, likely linked to the distinct modulation of the hypothalamic-pituitary-gonadal axis of female guanacos during short and long days.
dc.description.funderComision Nacional de Ciencia y Tecnologia (CONICYT), BECA DOCTORADO NACIONAL 2016
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.ygcen.2023.114427
dc.identifier.eissn1095-6840
dc.identifier.issn0016-6480
dc.identifier.urihttps://doi.org/10.1016/j.ygcen.2023.114427
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90984
dc.identifier.wosidWOS:001165866700001
dc.language.isoen
dc.revistaGeneral and comparative endocrinology
dc.rightsacceso restringido
dc.subjectGuanaco
dc.subjectPhotoperiod
dc.subjectMelatonin
dc.subjectGonadotrophins
dc.subjectKisspeptin
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleHypothalamic-pituitary-gonadal axis response to photoperiod changes in female guanacos (<i>Lama guanicoe</i>)
dc.typeartículo
dc.volumen347
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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