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Sexual Behavior in Continuously Cycling Rats

Donna Fitzroy Hardy
Behaviour
Vol. 41, No. 3/4 (1972), pp. 288-297
Published by: Brill
Stable URL: http://www.jstor.org/stable/4533442
Page Count: 10
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Sexual Behavior in Continuously Cycling Rats
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Abstract

The succession of vaginal and behavioral changes was followed throughout the estrous cycle of ten continuously cycling female rats. Interruption of cycles by pregnancy or pseudopregnancy was prevented by the use of the vaginal mask. The behavioral indices were Lordosis Quotient, a measure of sexual responsiveness, and Rejection Quotient, a measure of tolerance by the female of mounting by the male. Before the onset of lordosis, which took place during proestrus, females rejected males on many attempted mounts, although rejection decreased rapidly with rise in frequency of lordosis. Full receptivity was displayed for 6 to 9 hours, but females began to reject the males while still displaying high levels of lordosis. The total period of 19 hours over which lordosis is shown was divided into pre-heat, heat, and post-heat periods. /// La succession des changements du vagin et de ceux du comportement fut observée pour dix femelles adultes de Rat normalement constituées, pendant tout leur cycle oestriel. L'interruption du cycle par grossesse ou pseudogrossesse fut empêchée par "masque" vaginal. Les indices de comportement furent le quotient de lordose en tant que mesure de la réceptivité sexuelle; et pour la mesure de la tolérence de l'accouplement, le quotient de refus de la femelle. Avant la lordose, qui se manifestait pendant le rut, les femelles repoussèrent les tentatives réitérées d'accouplent, mais ce refus se relâcha vite avec une lordose accusée. Une réceptivité complète se manifesta pendant six à neuf heures, puis les femelles recommencèrent à repousser les mâles tout en manifestant une lordose encore caractérisée. La durée totale de la lordose, qui est de dix-neuf heures, se divise en période pré-oestrienne, oestrus proprement dit et période post-oestrienne.

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