Superfoetation of Mice

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DURING experiments in our laboratory on the effects of environmental temperature on mice, anomalous gestations have been observed. We give here examples of the birth of litters too soon after a previous litter to be the result of a normal post-partum insemination. In this account, by “superfoetation” we mean the occurrence in the same animal of two pregnancies at different stages of development1.

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BARNETT, S., MUNRO, K. Superfoetation of Mice. Nature 227, 1343–1344 (1970) doi:10.1038/2271343a0

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