Selective retrieving by maternal and nonmaternal female rats.

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Abstract
An earler study reported that nonpregnant females do not selectively retrieve a pup over a small plastic toy, while lactating mothers retrieve the pup more often than the toy. The present study was undertaken to see whether nonpregnant females made maternal by exposure to pups would act more like nonmaternal females than lactating mothers. The behavior toward a pup and a toy was studied in 1 group of nonmaternal virgins, 2 groups of maternal virgins, and 1 group of lactating mothers, during 7 daily 5-min. tests. Measures of the frequency and duration of retrieving-related behavior and analysis of behavioral sequences in relation to the pup and toy showed that pup-induced maternal virgins more closely resemble the lactating mothers than nonmaternal virgins.

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