Letter | Published:

Polyspermy after Induced Hyperthermia in Rats

Naturevolume 175page1038 (1955) | Download Citation



IT was reported earlier1 that the incidence of polyspermy in rats increased about seven times if coitus were not permitted at the normal time but delayed until after ovulation. When coitus occurred between 8 and 10 a.m., nearly 9 per cent of the eggs became polyspermic, whereas after normal mating only a little more than 1 per cent were polyspermic. These results were obtained in Sydney, Australia, with rats of an albino type.

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  1. 1

    Austin, C. R., and Braden, A. W. H., Nature, 172, 82, (1953); Aust. J. Biol. Sci., 6, 674 (1953).

  2. 2

    Austin, C. R., and Braden, A. W. H., Aust. J. Biol. Sci., 7, 195 (1954).

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  1. National Institute for Medical Research, Mill Hill, London, N.W.7

    • C. R. AUSTIN


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