Effect of early and later colony housing on oral ingestion of morphine in rats

@article{Alexander1981EffectOE,
  title={Effect of early and later colony housing on oral ingestion of morphine in rats},
  author={Bruce K. Alexander and Barry L. Beyerstein and Patricia F. Hadaway and Robert B. Coambs},
  journal={Pharmacology Biochemistry and Behavior},
  year={1981},
  volume={15},
  pages={571-576}
}
Male and female rats were raised from weaning either in isolation or in a large colony. At 65 days of age, half the rats in each environment were moved to the other. At 80 days, the animals were given continuous access to water and to a sequence of 7 solutions: 3 sweet or bitter-sweet control solutions and 4 different concentrations of morphine hydrochloride (MHCl) in 10% sucrose solution. Rats housed in the colony at the time of testing drank less MHCl solution than isolated rats, but no less… Expand

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