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Receptivity ratings of female rats that had been injected neonatally with either sesame oil or varying amounts of testosterone propionate (TP) were compared, using either a currently used manual technique or males as the test stimuli. Females receiving more than 10 µg. TP when 5 days old either rejected the male or gave minimal lordotic responses when mounted. However, they often responded with complete lordosis when manually stimulated. Untreated females in heat tended to obtain higher receptivity ratings with males than with the manual stimulus. In general, manual test ratings were found to be less related to oestrous conditions than those recorded with males. Some of the limitations and advantages of each method are discussed.