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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >A neuroendocrine model for prolactin as the key mediator of seasonal breeding in birds under long- and short-day photoperiods.
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A neuroendocrine model for prolactin as the key mediator of seasonal breeding in birds under long- and short-day photoperiods.

机译：催乳素的神经内分泌模型，是长短日照周期下鸟类季节性繁殖的关键介体。

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摘要

Seasonal breeding is associated with sequential increases in plasma luteinizing hormone (LH) and prolactin in the short-day breeding emu, and in long-day breeding birds that terminate breeding by the development of reproductive photorefractoriness. A model of the avian neuroendocrine photoperiodic reproductive response is proposed, incorporating a role for prolactin, to account for neuroendocrine mechanisms controlling both long- and short-day breeding. The breeding season terminates after circulating concentrations of prolactin increase above a critical threshold to depress gonadotropin releasing hormone (GnRH) neuronal and gonadotrope (LH) activity. Subsequently, photorefractoriness develops for prolactin secretion and for LH secretion, independently of high plasma prolactin. The breeding season in the emu is advanced compared with long-day breeders, because after photorefractiness for both LH and prolactin secretion is dissipated, plasma concentrations of both hormones increase to maximum values while days are still short.
机译：季节性繁殖与短日繁殖e中血浆黄体生成激素（LH）和催乳素的顺序增加有关，而长日繁殖禽类由于生殖光敏性的发展而终止繁殖。提出了一种禽神经内分泌光周期生殖反应模型，该模型结合了催乳激素的作用，以解释控制长日和短日繁殖的神经内分泌机制。循环中的催乳素浓度增加到超过临界阈值以抑制促性腺激素释放激素（GnRH）神经元和促性腺激素（LH）活性后，繁殖季节终止。随后，与高血浆催乳素无关，光致耐性发展为催乳激素分泌和LH分泌。与长日饲养员相比，e的繁殖季节提前了，因为在LH和催乳素分泌的光折射消失之后，两种激素的血浆浓度都增加到最大值，而日子仍然很短。

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