Bats are mammals that play a fundamental role in the regulation of the ecosystems by, for example, controlling the insect populations. Therefore, insectivorous species, such as Molossusmolossus, have become the target of great scientific interest. Despite the different studies that exist on the species, there is still no consensus regarding its reproduction. Thus, this study aimed to analyze the morphophysiology and some aspects of the hormonal control of the testes of M. molossus (Chiroptera: Molossidae), by evaluating its morphological and morphometric variations throughout the annual reproductive cycle. Sixty sexually adult males of M. molossus were used in the study, with five specimens collected each month for one year, forming 12 sample groups. The testes of each bat were submitted to morphological, morphometric, and immunohistochemical analyses. Molossusmolossus presented an annual reproductive cycle with two peaks of spermatogenic activity, one in April and the other in September, and a period of total testicular regression in December, which has never been described. The cycle appeared to be regulated by rainfall and was, at least partially, controlled by the expression of the androgen receptor in Sertoli cells, which has agonist effects on cell proliferation.

中文翻译：

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蝙蝠 Molossus 雄性的年度生殖周期：季节性双峰聚酯、睾丸退化和激素控制的某些方面

蝙蝠是哺乳动物，在调节生态系统中发挥着重要作用，例如通过控制昆虫种群。因此，食虫物种，如 Molossusmolossus，已成为具有重大科学意义的目标。尽管对该物种存在不同的研究，但对其繁殖仍未达成共识。因此，本研究旨在通过评估 M. molossus (Chiroptera: Molossidae) 睾丸在整个年度生殖周期中的形态学和形态测量变化，分析其睾丸的形态生理学和激素控制的某些方面。研究中使用了 60 只 M. molossus 的有性成年雄性，一年内每月收集 5 个标本，形成 12 个样本组。对每只蝙蝠的睾丸进行形态学、形态测量、和免疫组织化学分析。Molossusmolossus 呈现一年一度的生殖周期，有两个生精活动高峰，一个在 4 月，另一个在 9 月，12 月有一段睾丸完全退化的时期，这一点从未被描述过。该周期似乎受降雨调节，并且至少部分受支持细胞中雄激素受体的表达控制，雄激素受体对细胞增殖具有激动剂作用。