Abstract
It is known that association with the male can have a marked stimulatory influence on the reproductive behaviour of the female in a number of species. A shortening of oestrous cycles and synchronization of oestrus in grouped mice, for example, is brought about by the presence of a male (Whitten, 1958). Allied phenomena have been reported for the sheep (Schinckel, 1954; Radford & Watson, 1957), pig (Signoret & du Mesnil du Buisson, 1961), goat (Shelton, 1960) and rat (Hughes, 1964). Cooper & Haynes (1967) demonstrated that the introduction of different males each day for 15 hr into the cages of female rats showing lengthened cycles due to dietary restriction resulted in a significant shortening of the oestrous cycle. A number of rats did not mate at the first oestrus and the subsequent cycle was again of shorter duration than those before introduction of the male. This indicated that the female continued to respond to the male. It was recently shown that physical contact with the male
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