Supernumerary births - Kajoutatai

Japanese: 過剰多胎 - かじょうたたい
Supernumerary births - Kajoutatai

…When such animals are bred, implantation of embryos occurs in excess of the normal number of implantations. This phenomenon is called superfetation or superpregnancy. In cases of superfetation or superpregnancy, fetal death or resorption often occurs due to overcrowding in the uterus, and the number of offspring is often not very large. …

*Some of the terminology that refers to "excessive multiple births" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このような動物を交配すると,正常の着床数をはかるに超える胚の着床が起こる。過剰多胎superfetationとか,過剰妊娠superpregnancyと呼ばれる現象である。過剰多胎や過剰妊娠にあっては,子宮内における胎児の過密のため,しばしば胎児の死亡や再吸収が起こり,産子数はそれほど多くならない場合が多い。…

※「過剰多胎」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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