Age of Weaning in Two Subspecies of Deer Mice

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Science  08 Feb 1963:
Vol. 139, Issue 3554, pp. 483-484
DOI: 10.1126/science.139.3554.483


Weaning age in deer mice is defined as the age at which the young mice maintain or gain weight during a 24-hour period of isolation; mice younger than weaning age lose weight. Two subspecies of deer mice differed in weaning age; the age for Peromyscus maniculatus bairdii was 18 days; for P. m. gracilis, 24 days. Age and food consumption were better predictors of the weaning condition, as defined in terms of weight change with isolation, than body weight.

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