OBSERVATIONS ON THE ABILITY OF THE STUD MALE TO BLOCK PREGNANCY IN THE MOUSE

SUZANNE BLOCH

doi:10.1530/jrf.0.0380469

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OBSERVATIONS ON THE ABILITY OF THE STUD MALE TO BLOCK PREGNANCY IN THE MOUSE

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SUZANNE BLOCH

SUZANNE BLOCH
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DOI:: https://doi.org/10.1530/jrf.0.0380469

Volume/Issue:: Volume 38: Issue 2

Page Range:: 469–471

Article Type:: Research Article

Online Publication Date:: Jun 1974

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The block to pregnancy in newly mated female mice caused by the proximity of a strange male (`Bruce effect') occurs in a greater number of females when the male belongs to a different strain from the female (alien male) than when he belongs to the same strain (strange male) (Bruce, 1960; Parkes & Bruce, 1961). The difference between strains implies that the uniformity of odour or `spectrum of odours' of a strain is more powerful than individual differences between males. The proportion of blocked pregnancies was not influenced between males of the same strain when the `strange males' were litter-mates of the female and/or of the stud male (Bloch & Wyss, 1972).

Some observations, however, suggest a certain ability of the female to discriminate between individual males. According to Bruce (1960, 1968, 1969),

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