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The influence of exteroceptive factors on the estrous cycle of the collared lemming (Dicrostonyx groenlandicus).

The influence of exteroceptive factors on the estrous cycle of the collared lemming (Dicrostonyx groenlandicus) was studied. Vaginal smears were made daily for 16-60 days on 108 females ages 3-9 months. A repetitive estrous cycle was not revealed by the smears. Those with cornified smears were usually receptive whereas those with leucocyte smears were almost never receptive. Ovaries uteri and adrenals were heavier (p less than .001 p less than .001 p less than .05 respectively) and there were more (p less than .005) and larger (p less than .001) graafian follicles in estrous than in diestrous females. Females maintained on 6-hour photoperiods were less stimulated (p less than .025) than those on 18 hour and those on 24 hour were more stimulated (p less than .0005) than those on 18-hour photoperiods. Vaginal perforation and estrus were induced when anestrous females were caged with an intact male another female or adjacent to an intact male but not adjacent to another female or with a castrate male. Vaginal plugs were found in 17 of 28 females caged with males and litter were born to 13 3 of which a plug has not been detected during the 10 days of pairing with males.