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FURTHER OBSERVATIONS ON THE ABILITY OF THE MALE TO INFLUENCE THE OESTROUS CYCLE OF THE UNDERFED RAT

It is established that male proximity can influence the oestrous cycle of the underfed rat even when physical contact between the sexes is prevented; the lengthened cycles characteristic of underfeeding becoming significantly shorter (Cooper & Haynes, 1967; McNeilly, Cooper & Crighton, 1970). More recently, it has been shown that exposure for 15 hr/day to different male rats can elicit a greater and more sustained response from the female than continuous exposure to the same male partner (Purvis, Cooper & Haynes, 1971). This work, however, did not distinguish between two possibilities, namely, whether the stimulating effect of discontinuous association was a result of periodic removal and reintroduction of the stimulus or of regular alteration of the stimulus by the use of different males. The object of the