Formation and Diachronic Changes of Placental Scars in the House Shrew (Suncus murinus)

Kyosuke Nakano, K. Mekada
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引用次数: 1

Abstract

In the present study, diachronic changes in fresh and stained placental scars of postpartum house shrews (Suncus murinus) were studied and compared with the actual number of offspring. In non- stained fresh uteri, the placental scars were barely visible externally, except in some exceptional cases. In stained uteri, placental scars were observed in all specimens, even in the oldest animals evaluated (12 months postpartum). The study estimated the number of offspring and time of parturition using the degree of staining in the scars and the change in their forms.  As the time postpartum increased, the stained placental scars became discoloured and shrank, making it difficult to distinguish between the scars from normal parturition and those that formed following halted development after implantation. Placental scars provided an invaluable method for estimating the female reproductive state in wild mammals. In captive house shrews, however, placental scars were barely detected in non- stained fresh uteri. Moreover, placental scars were observed in older animals at 12 months postpartum. It can be concluded that, it is not feasible to estimate the number of offspring or time of parturition based on placental scars in wild shrews, which are believed to undergo multiple parturitions a year.
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家鼩胎盘瘢痕的形成及历时性变化
本研究研究了产后家鼩胎盘疤痕的历时性变化,并与实际子代数量进行了比较。在未染色的新鲜子宫中,除了一些特殊病例外,胎盘疤痕几乎不可见。在染色的子宫中,所有标本都观察到胎盘疤痕,即使是最老的动物(产后12个月)。该研究通过疤痕的染色程度和形状的变化来估计后代的数量和分娩时间。随着产后时间的增加,染色的胎盘疤痕变色缩小,难以区分正常分娩的疤痕和着床后发育停止形成的疤痕。胎盘疤痕为估计野生哺乳动物雌性生殖状态提供了宝贵的方法。然而,在圈养的家鼩中,在未染色的新鲜子宫中几乎检测不到胎盘疤痕。此外,在产后12个月的老年动物中观察到胎盘疤痕。由此可见,野生鼩鼱每年会有多次分娩,根据胎盘疤痕来估计后代数量或分娩时间是不可行的。
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