Development of hamster circadian rhythms: prenatal entrainment of the pacemaker.

@article{Davis1985DevelopmentOH,
  title={Development of hamster circadian rhythms: prenatal entrainment of the pacemaker.},
  author={Fred C. Davis and Roger A. Gorski},
  journal={Journal of biological rhythms},
  year={1985},
  volume={1 1},
  pages={77-89}
}
Individual hamster pups were maintained in constant dim light from just prior to birth, and their circadian wheel-running activity rhythms were recorded beginning at 18 days of age. Records of the postweaning free-running activity rhythm were used to determine the phase of a pup's rhythm on the day of weaning. Two groups of pups (LD and DL) were born to mothers that had been entrained before birth to light-dark cycles 12 hr out of phase. Both groups of pups were raised in constant dim light by… CONTINUE READING