Reproductive photoresponsiveness in unmanipulated male Fischer 344 laboratory rats.

@article{Heideman1997ReproductivePI,
  title={Reproductive photoresponsiveness in unmanipulated male Fischer 344 laboratory rats.},
  author={Paul Heideman and Cara J. Sylvester},
  journal={Biology of reproduction},
  year={1997},
  volume={57 1},
  pages={134-8}
}
Laboratory rats are considered to be reproductively unresponsive to photoperiod because photoperiod treatments do not induce robust reproductive responses. Groups of 15 young male Fischer 344 (F344) rats were tested for effects of long (16L:8D) and short (8L:16D) photoperiods on testicular development and body mass. Two weeks of short photoperiod inhibited testicular growth, spermatogenesis, and increases in body weight. Testis size became refractory to short photoperiod after 8 wk, but the… CONTINUE READING

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