Abstract
To determine whether opiate consumption is affected by laboratory housing, individually caged and colony rats were given a choice between water and progressively more palatable morphine-sucrose solutions. The isolated rats drank significantly more of the opiate solution, and females drank significantly more than males. In the experimental phase during which morphine-sucrose solution consumption was greatest, the isolated females drank five times as much, and the isolated males sixteen times as much morphine (mg/kg) as the colony females and males respectively.
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Hadaway, P.F., Alexander, B.K., Coambs, R.B. et al. The effect of housing and gender on preference for morphine-sucrose solutions in rats. Psychopharmacology 66, 87–91 (1979). https://doi.org/10.1007/BF00431995
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DOI: https://doi.org/10.1007/BF00431995