Parturient Mice: Effect of Environment on Labor

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Science  25 Mar 1966:
Vol. 151, Issue 3717, pp. 1560-1561
DOI: 10.1126/science.151.3717.1560


More first-born pups and greater numbers of pups were born in a familiar cage having a covered nesting box than in a glass bowl, when pregnant mice at term were alternated between contrasting environments. Current theories emphasize the influence on labor of mechanical and hormonal factors; these data suggest that environmental factors also may play a role.

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